(AP Photo/Alastair Grant)

LONDON (AP) Roger Federer got back on track at the ATP Finals, beating Matteo Berrettini 7-6 (2), 6-3 on Tuesday for his first victory of the round-robin stage.

Federer lost his opening match to Dominic Thiem on Sunday but the six-time champion looked sharper against Berrettini, never dropping his serve and hitting 24 winners.

Federer has failed to reach the semifinals only once in his previous 16 appearances, in 2008, but probably has to beat Novak Djokovic in his final group match on Thursday to advance.

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