Most ATP Masters 1000 singles titles won in a season

Novak Djokovic (Serbia) won six of the nine ATP (Association of Tennis Professionals) Masters 1000 singles titles in 2015. The world number one emerged victorious in Indian Wells, Miami, Monte Carlo, Rome, Shanghai and Paris, taking his total number of Masters 1000 tournament wins to 26 by the end of the 2015 season.

Djokovic beat his own record of five Masters 1000 singles titles in a season, set in 2011. The feat was matched by Rafael Nadal in 2013. The Masters 1000 circuit began in 2009 and was preceded by the ATP Masters Series (1990-2008) and the Grand Prix Super Series (1970–89). In the history of the format, only Rod Laver (in 1970), Jimmy Connors (in 1976), Nadal and Djokovic had won five singles tournaments in a season before Djokovic re-wrote the record books in 2015.

Only Rafael Nadal has more Masters 1000 singles titles than Djokovic, with 27 wins between 2005 and 2014.

The first of Djokovic's Masters 1000 singles titles came in Miami in 2007.

Djokovic won a total of 11 ATP titles in 2015. In addition to six Masters 1000 titles, he won three Grand Slams (Australian Open, Wimbledon, US Open), the China Open (a World Tour 500 event) and the season-ending World Tour Finals.

The nine ATP World Tour Masters 1000 tournaments are regarded as the most prestigious events on the ATP calendar after the four Grand Slams and the World Tour Finals.