Claim: Novak Djokovic broke the single-season tennis record.
Evidence: 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-.
The ATP World Tour Masters 1000 -LRB- previously known as the ATP Championship Series , Single-Week , ATP Super 9 , Tennis Masters Series , and ATP Masters Series -RRB- is the third highest tier of men 's tennis tournament after the four Grand Slam tournaments and ATP World Tour Finals.