2020 ATP Tour
The 2020 ATP Tour calendar was composed of the Grand Slam tournaments ( supervised by the International Tennis Federation ( ITF ) ) , the ATP Finals , the ATP Tour Masters 1000 , the ATP Cup , the ATP Tour 500 series , the ATP Tour 250 series , and the Davis Cup ( organised by the ITF ) . 
<triplet> Davis Cup <subj> International Tennis Federation <obj> organizer