Switzerland's Roger Federer celebrates winning his ATP World Tour Finals men's singles tennis match against South Africa's Kevin Anderson at the O2 arena in London, Thursday, Nov. 15, 2018. (John Walton/PA via AP)

LONDON (AP) Roger Federer is peaking at the right time - again.

The six-time champion advanced to the last four of the ATP Finals for a record-extending 15th time with a 6-4, 6-3 victory over Kevin Anderson on Thursday.

Federer, chasing the 100th title of his career, needed only a set to advance and produced his best performance at the season-ending tournament to end the round-robin stages with a 2-1 win-loss record.

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