Djokovic and Zverev off to winning starts at ATP Finals

Results from the ATP World Tour Finals, Men’s Singles matches on Monday:

Round Robin
1-Novak Djokovic (SRB) beat 8-John Isner (USA) 6-4 6-3
3-Alexander Zverev (GER) beat 5-Marin Cilic (CRO) 7-6(5) 7-6(1)