By Martyn Herman

LONDON (Reuters) - Mardy Fish will go into the second week at Wimbledon as the lone American survivor in the men's singles after getting past Dutchman Robin Haase in a delayed third-round match on Saturday.

The 10th seed was leading 6-3 6-7 6-2 1-1 when Haase walked to the net to offer his hand, complaining of a knee problem.

After Andy Roddick's straight-sets defeat by Feliciano Lopez on Friday, only Fish and Alex Bogomolov were still alive in the men's draw on middle Saturday but Bogomolov was quickly finished off by 2010 runner-up Tomas Berdych after being saved by the rain the previous day.

"Mardy is still playing well. I think he can go well because he has a great game for grass," Bogmolov said after his 6-2 6-4 6-3 defeat by the hard-hitting Czech.

"Sad to see no more Americans, but I think Ryan Harrison did a good job out here as well. Personally I'm going to get ready for the hard court season, which is my favorite."

Fish comfortably took the first set and seemed set to win the second when he had Haase in trouble on serve at 5-5. He wasted several chances to break and paid the price when he was dragged into a tiebreak which Haase pinched 7-5.

The 29-year-old upped his game in the third to forge back in front and he was well in command when Haase quit.

Fish can now look forward to his first fourth-round appearance at Wimbledon on Monday, against Berdych.

Nine American men started in the draw.

(Reporting by Martyn Herman, editing by Ed Osmond)