Collated results from the second day of the ATP Finals at London's O2 Arena on Monday (x denotes seeding): Singles Group Tokyo 1970 Novak Djokovic (SRB x1) bt Diego Schwartzman (ARG x8) 6-3, 6-2 Daniil Medvedev (RUS x4) v Alexander Zverev (GER x5) 6-3, 6-4 Doubles Group Bob Bryan Marcel Granollers/Horacio Zeballos (ESP/ARG x4) bt John Peers/Michael Venus (AUS/NZL x6) 7-6 (7/2), 7-5 Mate Pavic/Bruno Soares (CRO/BRA x1) bt Jurgen Melzer/Edouard Roger-Vasselin (AUT/FRA x7) 6-7 (6/8), 6-1, 10-4 afp