体坛英语新闻：Federer reaches fourth round, marathon man Isner loses quickly at Wimbledon

"I've never been this exhausted before," Isner said. "Mentally and physically, I was obviously a bit drained. I just didn't have much in the way of my legs. I was just low on fuel out there. Didn't really have a chance."

Besides, former Wimbledon champion Lleyton Hewitt of Australia battled into the fourth round on Friday, setting up an encounter with the third seed Novak Djokovic.

The 15th seed Hewitt needed two hours and nine minutes to see off French 21st seed Gael Monfils 6-3, 7-6(9), 6-4 to advance into the last 16 at his consecutive 12th appearance at the All England Club.

Hewitt, 29, won the Wimbledon title in 2002. He is going to face Serbian ace Djokovic as the world number three grabbed an easy 6-1, 6-4, 6-4 win over Spanish Albert Montanes on Friday.

Fifth seed Andy Roddick stormed into the fourth round of Wimbledon by beating German Philipp Kohlschreiber here on Friday.

The American served 28 aces to win 7-5, 6-7 (5), 6-3, 6-3.

In women's play, five-time champion Venus Williams secured a place in the fourth round with a 6-4, 6-2 win over Russia's Alisa Kleybanova at Wimbledon on Friday. She will next meet with Australia's Jarmila Groth, and could eventually meet top-ranked sister Serena in the final.