<P> Federer entered the top 100 ranking for the first time on 20 September 1999 and started at the 1999 Marseille Open defeating the reigning champion of the 1998 French Open, Spaniard Carlos Moya . His first final came at the Marseille Open in 2000, where he lost to fellow Swiss Marc Rosset . Federer won the 2001 Hopman Cup representing Switzerland, along with Martina Hingis . The duo defeated the American pair of Monica Seles and Jan - Michael Gambill in the finals . Federer's first singles win was at the 2001 Milan Indoor tournament, where he defeated Julien Boutter in the final . Although he won his first title already in 1999 on the Challenger tour, winning the doubles event in Segovia, Spain with Dutchman Sander Groen, the final was played on Federer's 18th birthday . In 2001, Federer made his first Grand Slam quarterfinal at the French Open, and at Wimbledon that same year defeated four - time defending champion Pete Sampras to reach the quarterfinals . The most prestigious event final he reached during this period was the 2002 Miami Masters event, where he lost to Andre Agassi on hard court . </P> <P> Federer won his first Master Series event at the 2002 Hamburg Masters on clay, over Marat Safin; the victory put him in top 10 for the first time . Federer made 10 singles finals between 1998 and 2002, of which he won four and lost six . He also made six finals in doubles . Of note are Federer and partner Max Mirnyi's defeat in the final of the Indian Wells Masters in 2002, and their victory in the same year in the final of the Rotterdam 500 series event . Federer had won the latter a year earlier with partner Jonas Björkman . He finished 2001 with an ATP ranking of #13, and 2002 was the first year he was ranked within the top 10, finishing at #6 . </P> <P> In 2003, Federer won his first Grand Slam singles title at Wimbledon, beating Mark Philippoussis in the final . Federer won his first and only doubles Masters Series 1000 event in Miami with Max Mirnyi and made it to one singles Masters Series 1000 event in Rome on clay, which he lost . Federer made it to nine finals on the ATP Tour and won seven of them, including the 500 series events at Dubai and Vienna . Lastly, Federer won the year - end championships over Andre Agassi, finishing the year as world #2, narrowly behind Andy Roddick by only 160 points . </P> <P> During 2004, Federer won three Grand Slam singles titles for the first time in his career and became the first person to do so since Mats Wilander in 1988 . His first major hard - court title came at the Australian Open over Marat Safin, thereby becoming the world #1 for the first time . He then won his second Wimbledon crown over Andy Roddick . Federer defeated the 2001 US Open champion, Lleyton Hewitt, at the US Open for his first title there . </P>

Who did roger federer beat in his first grand slam