<P> The ATP World Tour Masters 1000 (previously known as the ATP Championship Series, Single - Week, ATP Mercedes - Benz Super 9, Tennis Masters Series, and ATP Masters Series) is the third highest tier of annual men's tennis tournament after the four Grand Slam tournaments and the ATP Finals . </P> <P> Results in ATP Masters 1000 events earn players more world ranking points than regular tournaments, though not as many as Grand Slam events or the year - end ATP Finals . Up until 2007, most Masters Series finals were contested as best of five - set matches . Currently, all Masters Series matches (including the finals) are decided in best of three - set matches . </P> <P> Rafael Nadal and Novak Djokovic hold the record for the most singles titles with 30 since the Masters series began in 1990 . Nadal and Djokovic held all 9 Masters 1000 crowns starting with the 2013 Monte Carlo title through the 2014 Miami title, which was the first time that 2 players possessed all nine of the titles . The Bryan Brothers have won a record 36 doubles titles, all as a team . No player has ever won all 9 singles titles in his career, with Novak Djokovic winning 8, and Andre Agassi, Roger Federer, Rafael Nadal and Andy Murray each winning 7 . However, in doubles, Daniel Nestor and the Bryan Brothers (Bob and Mike) have each won all 9 titles throughout their careers . Djokovic holds the record for 6 singles titles in a year (2015). In doubles, the Bryans have won 6 titles in a single year once (2014) and 5 titles in a single year twice (2007 and 2013). </P> <Table> <Tr> <Th> Tournament </Th> <Th> Country </Th> <Th> Location </Th> <Th> Current Venue </Th> <Th> 2017 Event Calendar </Th> <Th> Began </Th> <Th> Court surface </Th> <Th> Central court capacity </Th> <Th> Draw </Th> <Th> Defending champion </Th> <Th> Prize </Th> </Tr> <Tr> <Td> Indian Wells Masters </Td> <Td> United States </Td> <Td> Indian Wells, California </Td> <Td> Indian Wells Tennis Garden </Td> <Td> March 9--19 </Td> <Td> </Td> <Td> Hard </Td> <Td> 16,100 </Td> <Td> 96 </Td> <Td> Roger Federer </Td> <Td> $8,092,625 </Td> </Tr> <Tr> <Td> Miami Open </Td> <Td> United States </Td> <Td> Key Biscayne, Florida (Miami) </Td> <Td> Tennis Center at Crandon Park </Td> <Td> March 23--April 2 </Td> <Td> 1985 </Td> <Td> Hard </Td> <Td> 13,300 </Td> <Td> 96 </Td> <Td> Roger Federer </Td> <Td> $6,993,450 </Td> </Tr> <Tr> <Td> Monte - Carlo Masters </Td> <Td> Monaco </Td> <Td> Roquebrune - Cap - Martin, France </Td> <Td> Monte Carlo Country Club </Td> <Td> April 16--23 </Td> <Td> 1897 </Td> <Td> Clay </Td> <Td> 10,000 </Td> <Td> 56 </Td> <Td> Rafael Nadal </Td> <Td> € 4,273,775 </Td> </Tr> <Tr> <Td> Madrid Open </Td> <Td> Spain </Td> <Td> Madrid </Td> <Td> Caja Mágica </Td> <Td> May 7--14 </Td> <Td> 2002 </Td> <Td> Clay </Td> <Td> 12,500 </Td> <Td> 56 </Td> <Td> Rafael Nadal </Td> <Td> € 5,439,350 </Td> </Tr> <Tr> <Td> Italian Open </Td> <Td> Italy </Td> <Td> Rome </Td> <Td> Foro Italico </Td> <Td> May 14--21 </Td> <Td> 1930 </Td> <Td> Clay </Td> <Td> 10,400 </Td> <Td> 56 </Td> <Td> Alexander Zverev </Td> <Td> € 4,273,775 </Td> </Tr> <Tr> <Td> Canadian Open </Td> <Td> Canada </Td> <Td> Montreal / Toronto </Td> <Td> Stade Uniprix / Aviva Centre </Td> <Td> August 7--13 </Td> <Td> 1881 </Td> <Td> Hard </Td> <Td> 11,700 / 12,500 </Td> <Td> 56 </Td> <Td> Alexander Zverev </Td> <Td> $4,662,300 </Td> </Tr> <Tr> <Td> Cincinnati Masters </Td> <Td> United States </Td> <Td> Mason, Ohio (Cincinnati) </Td> <Td> Lindner Family Tennis Center </Td> <Td> August 13--20 </Td> <Td> 1899 </Td> <Td> Hard </Td> <Td> 11,600 </Td> <Td> 56 </Td> <Td> Grigor Dimitrov </Td> <Td> $4,973,120 </Td> </Tr> <Tr> <Td> Shanghai Masters </Td> <Td> China </Td> <Td> Shanghai </Td> <Td> Qi Zhong Stadium </Td> <Td> October 8--15 </Td> <Td> 2009 </Td> <Td> Hard </Td> <Td> 15,000 </Td> <Td> 56 </Td> <Td> Roger Federer </Td> <Td> $8,092,625 </Td> </Tr> <Tr> <Td> Paris Masters </Td> <Td> France </Td> <Td> Paris </Td> <Td> AccorHotels Arena </Td> <Td> October 30--November 5 </Td> <Td> 1968 </Td> <Td> Hard (i) </Td> <Td> 14,000 </Td> <Td> 48 </Td> <Td> Jack Sock </Td> <Td> € 4,273,775 </Td> </Tr> </Table>

Who has won the most masters titles in tennis