Summary
Roger Federer said he had "flushed away" the pain of his defeat in the Wimbledon final as he prepared for a rematch against Novak Djokovic after keeping alive his hopes of a seventh ATP Finals crown Tuesday.
Federer, 38, will face the Serbian second seed Thursday in a repeat of July's marathon Wimbledon final, during which he squandered two championship points on his own serve.
Both Federer and eighth seed Berrettini were solid on serve in the first set of their contest.
Berrettini earned a clutch of break points in the eighth game but Federer eventually served himself out of trouble.
Djokovic is hunting a sixth ATP Finals title to pull level with Federer's record and is also seeking to pip Rafael Nadal to the year-end No. 1 ranking.
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