NEW YORK — John Isner struggled down the stretch and lost to Philipp Kohlschreiber 6-4, 3-6, 7-5, 7-6 (5) at the U.S. Open on Saturday.
Roger Federer worked quickly once again, beating 63rd-ranked Adrian Mannarino of France 6-3, 6-0, 6-2 in 1 hour, 21 minutes to get to the fourth round in Flushing Meadows for the 13th consecutive year. Through three matches, Federer has dropped 21 games and spent a total of 41/2; hours on court.
Next for Federer is 19th-seeded Tommy Robredo of Spain, who ended the run of 179th-ranked qualifier Daniel Evans of Britain 7-6 (6), 6-1, 4-6, 7-5. Win that, and Federer could face 12-time major champion Rafael Nadal in the quarterfinals; the two rivals never have played each other in New York.
Aside from Isner, the other American man in action Saturday, 20-year-old Jack Sock, was beaten 3-6, 7-6 (1), 6-1, 6-2 by No. 18 Janko Tipsarevic of Serbia.
So the last man from the United States left is Tim Smyczek, a 25-year-old from Milwaukee who got into the main draw thanks to a wild-card invitation from the U.S. Tennis Association and plays 43rd-ranked Marcel Granollers of Spain in the third round today. If Smyczek loses — a distinct possibility, considering he's ranked 109th and never before even made it past the second round at Grand Slam tournament — it will be the first time with zero U.S. men in the round of 16 at the country's tennis championship, which was first played in 1881.
There's a trio of Americans in the women's fourth round, because wild-card entry Alison Riske defeated Petra Kvitova 6-3, 6-0. The other two are Serena Williams and Sloane Stephens, who play each other today.