The 2019 ATP Tour was the global elite men's professional tennis circuit organised by the Association of Tennis Professionals (ATP) for the 2019 tennis season. The 2019 ATP Tour calendar comprised the Grand Slam tournaments, the ATP Tour Masters 1000, the ATP Finals, the ATP Tour 500 series, the ATP Tour 250 series and Davis Cup. Also included in the 2019 calendar were the Hopman Cup, the Laver Cup and the Next Gen ATP Finals which do not distribute ranking points. For the Masters series events the ATP introduced a shot clock. Players had a minute to come on court, 5 minutes to warmup, and then a minute to commence play, as well as 25 seconds between points.