<P> The rankings are sourced by the WTA Media Guide and the WTA website (which usually revises its rankings every Sunday night or Monday morning, except when tournament finals are postponed). </P> <P> On 11 September 2017, Garbiñe Muguruza and Rafael Nadal made Spain the first country since the United States 14 years ago to simultaneously top both the ATP and the WTA rankings, with Muguruza making her debut in the No. 1 spot . The most recent previous such pair were Serena Williams and Andre Agassi, 28 April to 11 May 2003 . </P> <Table> <Tr> <Th> New no . 1 </Th> <Th> Country </Th> <Th> Player </Th> <Th> Start date </Th> <Th> End date </Th> <Th_colspan="2"> Weeks </Th> </Tr> <Tr> <Th> series </Th> <Th> total </Th> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Chris Evert </Td> <Td> Nov 3, 1975 </Td> <Td> Apr 25, 1976 </Td> <Td> 25 </Td> <Td> 25 </Td> </Tr> <Tr> <Td> </Td> <Td> AUS </Td> <Td> Evonne Goolagong Cawley </Td> <Td> Apr 26, 1976 </Td> <Td> May 9, 1976 </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Chris Evert (2) </Td> <Td> May 10, 1976 </Td> <Td> Jul 9, 1978 </Td> <Td> 113 </Td> <Td> 138 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Martina Navratilova </Td> <Td> Jul 10, 1978 </Td> <Td> Jan 13, 1979 </Td> <Td> 26 </Td> <Td> 26 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Chris Evert (3) </Td> <Td> Jan 14, 1979 </Td> <Td> Jan 27, 1979 </Td> <Td> </Td> <Td> 140 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Martina Navratilova (2) </Td> <Td> Jan 28, 1979 </Td> <Td> Feb 24, 1979 </Td> <Td> </Td> <Td> 30 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Chris Evert (4) </Td> <Td> Feb 25, 1979 </Td> <Td> Apr 15, 1979 </Td> <Td> 7 </Td> <Td> 147 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Martina Navratilova (3) </Td> <Td> Apr 16, 1979 </Td> <Td> Jun 24, 1979 </Td> <Td> 10 </Td> <Td> 40 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Chris Evert (5) </Td> <Td> Jun 25, 1979 </Td> <Td> Sep 9, 1979 </Td> <Td> 11 </Td> <Td> 158 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Martina Navratilova (4) </Td> <Td> Sep 10, 1979 </Td> <Td> Apr 6, 1980 </Td> <Td> 31 </Td> <Td> 71 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Tracy Austin </Td> <Td> Apr 7, 1980 </Td> <Td> Apr 20, 1980 </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Martina Navratilova (5) </Td> <Td> Apr 21, 1980 </Td> <Td> Jul 6, 1980 </Td> <Td> 11 </Td> <Td> 82 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Tracy Austin (2) </Td> <Td> Jul 7, 1980 </Td> <Td> Nov 17, 1980 </Td> <Td> 19 </Td> <Td> 21 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Chris Evert (6) </Td> <Td> Nov 18, 1980 </Td> <Td> May 2, 1982 </Td> <Td> 76 </Td> <Td> 234 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Martina Navratilova (6) </Td> <Td> May 3, 1982 </Td> <Td> May 16, 1982 </Td> <Td> </Td> <Td> 84 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Chris Evert (7) </Td> <Td> May 17, 1982 </Td> <Td> Jun 13, 1982 </Td> <Td> </Td> <Td> 238 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Martina Navratilova (7) </Td> <Td> Jun 14, 1982 </Td> <Td> Jun 9, 1985 </Td> <Td> 156 </Td> <Td> 240 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Chris Evert (8) </Td> <Td> Jun 10, 1985 </Td> <Td> Oct 13, 1985 </Td> <Td> 18 </Td> <Td> 256 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Martina Navratilova (8) </Td> <Td> Oct 14, 1985 </Td> <Td> Oct 27, 1985 </Td> <Td> </Td> <Td> 242 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Chris Evert (9) </Td> <Td> Oct 28, 1985 </Td> <Td> Nov 24, 1985 </Td> <Td> </Td> <Td> 260 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Martina Navratilova (9) </Td> <Td> Nov 25, 1985 </Td> <Td> Aug 16, 1987 </Td> <Td> 90 </Td> <Td> 332 </Td> </Tr> <Tr> <Td> 5 </Td> <Td> GER </Td> <Td> Steffi Graf </Td> <Td> Aug 17, 1987 </Td> <Td> Mar 10, 1991 </Td> <Td> 186 </Td> <Td> 186 </Td> </Tr> <Tr> <Td> 6 </Td> <Td> YUG </Td> <Td> Monica Seles </Td> <Td> Mar 11, 1991 </Td> <Td> Aug 4, 1991 </Td> <Td> 21 </Td> <Td> 21 </Td> </Tr> <Tr> <Td> </Td> <Td> GER </Td> <Td> Steffi Graf (2) </Td> <Td> Aug 5, 1991 </Td> <Td> Aug 11, 1991 </Td> <Td> </Td> <Td> 187 </Td> </Tr> <Tr> <Td> </Td> <Td> YUG </Td> <Td> Monica Seles (2) </Td> <Td> Aug 12, 1991 </Td> <Td> Aug 18, 1991 </Td> <Td> </Td> <Td> 22 </Td> </Tr> <Tr> <Td> </Td> <Td> GER </Td> <Td> Steffi Graf (3) </Td> <Td> Aug 19, 1991 </Td> <Td> Sep 8, 1991 </Td> <Td> </Td> <Td> 190 </Td> </Tr> <Tr> <Td> </Td> <Td> / YUG </Td> <Td> Monica Seles (3) </Td> <Td> Sep 9, 1991 </Td> <Td> Jun 6, 1993 </Td> <Td> 91 </Td> <Td> 113 </Td> </Tr> <Tr> <Td> </Td> <Td> GER </Td> <Td> Steffi Graf (4) </Td> <Td> Jun 7, 1993 </Td> <Td> Feb 5, 1995 </Td> <Td> 87 </Td> <Td> 277 </Td> </Tr> <Tr> <Td> 7 </Td> <Td> ESP </Td> <Td> Arantxa Sánchez Vicario </Td> <Td> Feb 6, 1995 </Td> <Td> Feb 19, 1995 </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> GER </Td> <Td> Steffi Graf (5) </Td> <Td> Feb 20, 1995 </Td> <Td> Feb 26, 1995 </Td> <Td> </Td> <Td> 278 </Td> </Tr> <Tr> <Td> </Td> <Td> ESP </Td> <Td> Arantxa Sánchez Vicario (2) </Td> <Td> Feb 27, 1995 </Td> <Td> Apr 9, 1995 </Td> <Td> 6 </Td> <Td> 8 </Td> </Tr> <Tr> <Td> </Td> <Td> GER </Td> <Td> Steffi Graf (6) </Td> <Td> Apr 10, 1995 </Td> <Td> May 14, 1995 </Td> <Td> 5 </Td> <Td> 283 </Td> </Tr> <Tr> <Td> </Td> <Td> ESP </Td> <Td> Arantxa Sánchez Vicario (3) </Td> <Td> May 15, 1995 </Td> <Td> Jun 11, 1995 </Td> <Td> </Td> <Td> 12 </Td> </Tr> <Tr> <Td> </Td> <Td> GER </Td> <Td> Steffi Graf (7) </Td> <Td> Jun 12, 1995 </Td> <Td> Aug 14, 1995 </Td> <Td> 9 </Td> <Td> 292 </Td> </Tr> <Tr> <Td> </Td> <Td> GER USA </Td> <Td> Steffi Graf (7) Monica Seles (4) </Td> <Td> Aug 15, 1995 </Td> <Td> Nov 3, 1996 </Td> <Td> 64 </Td> <Td> 356 177 </Td> </Tr> <Tr> <Td> </Td> <Td> GER </Td> <Td> Steffi Graf (7) </Td> <Td> Nov 4, 1996 </Td> <Td> Nov 17, 1996 </Td> <Td> </Td> <Td> 358 </Td> </Tr> <Tr> <Td> </Td> <Td> GER USA </Td> <Td> Steffi Graf (7) Monica Seles (5) </Td> <Td> Nov 18, 1996 </Td> <Td> Nov 24, 1996 </Td> <Td> </Td> <Td> 359 178 </Td> </Tr> <Tr> <Td> </Td> <Td> GER </Td> <Td> Steffi Graf (7) </Td> <Td> Nov 25, 1996 </Td> <Td> Mar 30, 1997 </Td> <Td> 18 </Td> <Td> 377 </Td> </Tr> <Tr> <Td> 8 </Td> <Td> SUI </Td> <Td> Martina Hingis </Td> <Td> Mar 31, 1997 </Td> <Td> Oct 11, 1998 </Td> <Td> 80 </Td> <Td> 80 </Td> </Tr> <Tr> <Td> 9 </Td> <Td> USA </Td> <Td> Lindsay Davenport </Td> <Td> Oct 12, 1998 </Td> <Td> Feb 7, 1999 </Td> <Td> 17 </Td> <Td> 17 </Td> </Tr> <Tr> <Td> </Td> <Td> SUI </Td> <Td> Martina Hingis (2) </Td> <Td> Feb 8, 1999 </Td> <Td> Jul 4, 1999 </Td> <Td> 21 </Td> <Td> 101 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Lindsay Davenport (2) </Td> <Td> Jul 5, 1999 </Td> <Td> Aug 8, 1999 </Td> <Td> 5 </Td> <Td> 22 </Td> </Tr> <Tr> <Td> </Td> <Td> SUI </Td> <Td> Martina Hingis (3) </Td> <Td> Aug 9, 1999 </Td> <Td> Apr 2, 2000 </Td> <Td> 34 </Td> <Td> 135 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Lindsay Davenport (3) </Td> <Td> Apr 3, 2000 </Td> <Td> May 7, 2000 </Td> <Td> 5 </Td> <Td> 27 </Td> </Tr> <Tr> <Td> </Td> <Td> SUI </Td> <Td> Martina Hingis (4) </Td> <Td> May 8, 2000 </Td> <Td> May 14, 2000 </Td> <Td> </Td> <Td> 136 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Lindsay Davenport (4) </Td> <Td> May 15, 2000 </Td> <Td> May 21, 2000 </Td> <Td> </Td> <Td> 28 </Td> </Tr> <Tr> <Td> </Td> <Td> SUI </Td> <Td> Martina Hingis (5) </Td> <Td> May 22, 2000 </Td> <Td> Oct 14, 2001 </Td> <Td> 73 </Td> <Td> 209 </Td> </Tr> <Tr> <Td> 10 </Td> <Td> USA </Td> <Td> Jennifer Capriati </Td> <Td> Oct 15, 2001 </Td> <Td> Nov 4, 2001 </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Lindsay Davenport (5) </Td> <Td> Nov 5, 2001 </Td> <Td> Jan 13, 2002 </Td> <Td> 10 </Td> <Td> 38 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Jennifer Capriati (2) </Td> <Td> Jan 14, 2002 </Td> <Td> Feb 24, 2002 </Td> <Td> 6 </Td> <Td> 9 </Td> </Tr> <Tr> <Td> 11 </Td> <Td> USA </Td> <Td> Venus Williams </Td> <Td> Feb 25, 2002 </Td> <Td> Mar 17, 2002 </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Jennifer Capriati (3) </Td> <Td> Mar 18, 2002 </Td> <Td> Apr 21, 2002 </Td> <Td> 5 </Td> <Td> 14 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Venus Williams (2) </Td> <Td> Apr 22, 2002 </Td> <Td> May 19, 2002 </Td> <Td> </Td> <Td> 7 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Jennifer Capriati (4) </Td> <Td> May 20, 2002 </Td> <Td> Jun 9, 2002 </Td> <Td> </Td> <Td> 17 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Venus Williams (3) </Td> <Td> Jun 10, 2002 </Td> <Td> Jul 7, 2002 </Td> <Td> </Td> <Td> 11 </Td> </Tr> <Tr> <Td> 12 </Td> <Td> USA </Td> <Td> Serena Williams </Td> <Td> Jul 8, 2002 </Td> <Td> Aug 10, 2003 </Td> <Td> 57 </Td> <Td> 57 </Td> </Tr> <Tr> <Td> 13 </Td> <Td> BEL </Td> <Td> Kim Clijsters </Td> <Td> Aug 11, 2003 </Td> <Td> Oct 19, 2003 </Td> <Td> 10 </Td> <Td> 10 </Td> </Tr> <Tr> <Td> 14 </Td> <Td> BEL </Td> <Td> Justine Henin </Td> <Td> Oct 20, 2003 </Td> <Td> Oct 26, 2003 </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> BEL </Td> <Td> Kim Clijsters (2) </Td> <Td> Oct 27, 2003 </Td> <Td> Nov 9, 2003 </Td> <Td> </Td> <Td> 12 </Td> </Tr> <Tr> <Td> </Td> <Td> BEL </Td> <Td> Justine Henin (2) </Td> <Td> Nov 10, 2003 </Td> <Td> Sep 12, 2004 </Td> <Td> 44 </Td> <Td> 45 </Td> </Tr> <Tr> <Td> 15 </Td> <Td> FRA </Td> <Td> Amélie Mauresmo </Td> <Td> Sep 13, 2004 </Td> <Td> Oct 17, 2004 </Td> <Td> 5 </Td> <Td> 5 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Lindsay Davenport (6) </Td> <Td> Oct 18, 2004 </Td> <Td> Aug 21, 2005 </Td> <Td> 44 </Td> <Td> 82 </Td> </Tr> <Tr> <Td> 16 </Td> <Td> RUS </Td> <Td> Maria Sharapova </Td> <Td> Aug 22, 2005 </Td> <Td> Aug 28, 2005 </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Lindsay Davenport (7) </Td> <Td> Aug 29, 2005 </Td> <Td> Sep 11, 2005 </Td> <Td> </Td> <Td> 84 </Td> </Tr> <Tr> <Td> </Td> <Td> RUS </Td> <Td> Maria Sharapova (2) </Td> <Td> Sep 12, 2005 </Td> <Td> Oct 23, 2005 </Td> <Td> 6 </Td> <Td> 7 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Lindsay Davenport (8) </Td> <Td> Oct 24, 2005 </Td> <Td> Jan 29, 2006 </Td> <Td> 14 </Td> <Td> 98 </Td> </Tr> <Tr> <Td> </Td> <Td> BEL </Td> <Td> Kim Clijsters (3) </Td> <Td> Jan 30, 2006 </Td> <Td> Mar 19, 2006 </Td> <Td> 7 </Td> <Td> 19 </Td> </Tr> <Tr> <Td> </Td> <Td> FRA </Td> <Td> Amélie Mauresmo (2) </Td> <Td> Mar 20, 2006 </Td> <Td> Nov 12, 2006 </Td> <Td> 34 </Td> <Td> 39 </Td> </Tr> <Tr> <Td> </Td> <Td> BEL </Td> <Td> Justine Henin (3) </Td> <Td> Nov 13, 2006 </Td> <Td> Jan 28, 2007 </Td> <Td> 11 </Td> <Td> 56 </Td> </Tr> <Tr> <Td> </Td> <Td> RUS </Td> <Td> Maria Sharapova (3) </Td> <Td> Jan 29, 2007 </Td> <Td> Mar 18, 2007 </Td> <Td> 7 </Td> <Td> 14 </Td> </Tr> <Tr> <Td> </Td> <Td> BEL </Td> <Td> Justine Henin (4) </Td> <Td> Mar 19, 2007 </Td> <Td> May 18, 2008 </Td> <Td> 61 </Td> <Td> 117 </Td> </Tr> <Tr> <Td> </Td> <Td> RUS </Td> <Td> Maria Sharapova (4) </Td> <Td> May 19, 2008 </Td> <Td> Jun 8, 2008 </Td> <Td> </Td> <Td> 17 </Td> </Tr> <Tr> <Td> 17 </Td> <Td> SRB </Td> <Td> Ana Ivanovic </Td> <Td> Jun 9, 2008 </Td> <Td> Aug 10, 2008 </Td> <Td> 9 </Td> <Td> 9 </Td> </Tr> <Tr> <Td> 18 </Td> <Td> SRB </Td> <Td> Jelena Janković </Td> <Td> Aug 11, 2008 </Td> <Td> Aug 17, 2008 </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> </Td> <Td> SRB </Td> <Td> Ana Ivanovic (2) </Td> <Td> Aug 18, 2008 </Td> <Td> Sep 7, 2008 </Td> <Td> </Td> <Td> 12 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Serena Williams (2) </Td> <Td> Sep 8, 2008 </Td> <Td> Oct 5, 2008 </Td> <Td> </Td> <Td> 61 </Td> </Tr> <Tr> <Td> </Td> <Td> SRB </Td> <Td> Jelena Janković (2) </Td> <Td> Oct 6, 2008 </Td> <Td> Feb 1, 2009 </Td> <Td> 17 </Td> <Td> 18 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Serena Williams (3) </Td> <Td> Feb 2, 2009 </Td> <Td> Apr 19, 2009 </Td> <Td> 11 </Td> <Td> 72 </Td> </Tr> <Tr> <Td> 19 </Td> <Td> RUS </Td> <Td> Dinara Safina </Td> <Td> Apr 20, 2009 </Td> <Td> Oct 11, 2009 </Td> <Td> 25 </Td> <Td> 25 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Serena Williams (4) </Td> <Td> Oct 12, 2009 </Td> <Td> Oct 25, 2009 </Td> <Td> </Td> <Td> 74 </Td> </Tr> <Tr> <Td> </Td> <Td> RUS </Td> <Td> Dinara Safina (2) </Td> <Td> Oct 26, 2009 </Td> <Td> Nov 1, 2009 </Td> <Td> </Td> <Td> 26 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Serena Williams (5) </Td> <Td> Nov 2, 2009 </Td> <Td> Oct 10, 2010 </Td> <Td> 49 </Td> <Td> 123 </Td> </Tr> <Tr> <Td> 20 </Td> <Td> DEN </Td> <Td> Caroline Wozniacki </Td> <Td> Oct 11, 2010 </Td> <Td> Feb 13, 2011 </Td> <Td> 18 </Td> <Td> 18 </Td> </Tr> <Tr> <Td> </Td> <Td> BEL </Td> <Td> Kim Clijsters (4) </Td> <Td> Feb 14, 2011 </Td> <Td> Feb 20, 2011 </Td> <Td> </Td> <Td> 20 </Td> </Tr> <Tr> <Td> </Td> <Td> DEN </Td> <Td> Caroline Wozniacki (2) </Td> <Td> Feb 21, 2011 </Td> <Td> Jan 29, 2012 </Td> <Td> 49 </Td> <Td> 67 </Td> </Tr> <Tr> <Td> 21 </Td> <Td> BLR </Td> <Td> Victoria Azarenka </Td> <Td> Jan 30, 2012 </Td> <Td> Jun 10, 2012 </Td> <Td> 19 </Td> <Td> 19 </Td> </Tr> <Tr> <Td> </Td> <Td> RUS </Td> <Td> Maria Sharapova (5) </Td> <Td> Jun 11, 2012 </Td> <Td> Jul 8, 2012 </Td> <Td> </Td> <Td> 21 </Td> </Tr> <Tr> <Td> </Td> <Td> BLR </Td> <Td> Victoria Azarenka (2) </Td> <Td> Jul 9, 2012 </Td> <Td> Feb 17, 2013 </Td> <Td> 32 </Td> <Td> 51 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Serena Williams (6) </Td> <Td> Feb 18, 2013 </Td> <Td> Sep 11, 2016 </Td> <Td> 186 </Td> <Td> 309 </Td> </Tr> <Tr> <Td> 22 </Td> <Td> GER </Td> <Td> Angelique Kerber </Td> <Td> Sep 12, 2016 </Td> <Td> Jan 29, 2017 </Td> <Td> 20 </Td> <Td> 20 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Serena Williams (7) </Td> <Td> Jan 30, 2017 </Td> <Td> Mar 19, 2017 </Td> <Td> 7 </Td> <Td> 316 </Td> </Tr> <Tr> <Td> </Td> <Td> GER </Td> <Td> Angelique Kerber (2) </Td> <Td> Mar 20, 2017 </Td> <Td> Apr 23, 2017 </Td> <Td> 5 </Td> <Td> 25 </Td> </Tr> <Tr> <Td> </Td> <Td> USA </Td> <Td> Serena Williams (8) </Td> <Td> Apr 24, 2017 </Td> <Td> May 14, 2017 </Td> <Td> </Td> <Td> 319 </Td> </Tr> <Tr> <Td> </Td> <Td> GER </Td> <Td> Angelique Kerber (3) </Td> <Td> May 15, 2017 </Td> <Td> Jul 16, 2017 </Td> <Td> 9 </Td> <Td> 34 </Td> </Tr> <Tr> <Td> 23 </Td> <Td> CZE </Td> <Td> Karolína Plíšková </Td> <Td> Jul 17, 2017 </Td> <Td> Sep 10, 2017 </Td> <Td> 8 </Td> <Td> 8 </Td> </Tr> <Tr> <Td> 24 </Td> <Td> ESP </Td> <Td> Garbiñe Muguruza </Td> <Td> Sep 11, 2017 </Td> <Td> Oct 8, 2017 </Td> <Td> </Td> <Td> </Td> </Tr> <Tr> <Td> 25 </Td> <Td> ROU </Td> <Td> Simona Halep </Td> <Td> Oct 9, 2017 </Td> <Td> Jan 28, 2018 </Td> <Td> 16 </Td> <Td> 16 </Td> </Tr> <Tr> <Td> </Td> <Td> DEN </Td> <Td> Caroline Wozniacki (3) </Td> <Td> Jan 29, 2018 </Td> <Td> Feb 25, 2018 </Td> <Td> </Td> <Td> 71 </Td> </Tr> <Tr> <Td> </Td> <Td> ROU </Td> <Td> Simona Halep (2) </Td> <Td> Feb 26, 2018 </Td> <Td> Present </Td> <Td> </Td> <Td> 17 </Td> </Tr> </Table> <Tr> <Th> New no . 1 </Th> <Th> Country </Th> <Th> Player </Th> <Th> Start date </Th> <Th> End date </Th> <Th_colspan="2"> Weeks </Th> </Tr>

Who is currently ranked number one in women's tennis