Novak Djokovic played in the finals at all nine parties.
Djokovic 's records include breaking the single-season record with six masters titles in 2015 , winning 31 consecutive ATP World Tour Masters 1000 series matches , playing in the finals at all nine ATP Masters 1000 tournaments -LRB- shared with Roger Federer and Nadal , and being the only player to win eight of the nine events -LRB- and at least twice -RRB- .	ATP World Tour	ATP World Tour	2015	2015 ATP World Tour Finals  Singles	Masters 1000	ATP World Tour Masters 1000	ATP World Tour Masters 1000	ATP World Tour Masters 1000	Roger Federer	Roger Federer
