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One hundred matches and counting for Federer at the US Open -- but is there cause for concern for the Swiss?

Aug 29, 2019 - CNN

(CNN) -- Playing his 100th match at the US Open in 19 years is yet another marker of just how good Roger Federer has been -- and for so long.

But his 3-6, 6-2, 6-3, 6-4 second-round win over 99th-ranked Damir Dzumhur suggests it could be a struggle for the 20-time grand slam winner to get to an appetizing rematch with men's favorite Novak Djokovic in the semifinals.

Usually racing out of the blocks and suffocating opponents, Federer has lost the first set in his opening two round...