INDIAN WELLS, Calif. — Mardy Fish, who had never made it beyond the fourth round at Indian Wells, added to his string of surprises in this year's Pacific Life Open with a 6-3, 6-7 (5), 7-6 (4) victory over David Nalbandian.

Today's win over No. 7 Nalbandian put the 98th-ranked Fish into Saturday's semifinals, where he will need to pull off the upset of his life to advance. His next opponent is No. 1 Roger Federer, who is 5-0 against him.

Federer, going for his fourth Indian Wells title in five years, reached the semifinals when his quarterfinal opponent, Tommy Haas, had to forfeit because of a sinus infection.

Defending champion and No. 2 Rafael Nadal will play No. 3 Novak Djokovic, the Australian Open champion, in the other semifinal.

The 26-year-old Fish, making his sixth appearance in the desert tournament, lost to Federer in the fourth round in 2004, again in the second round the following year, and to Nadal in the third round two years ago.

On his way to the semifinals this year, Fish beat No. 4 Nikolay Davydenko 6-3, 6-2 and No. 24 and two-time champion Lleyton Hewitt 7-5, 3-6, 7-6(4).

After Nalbandian broke his serve to go up 6-5 in the third set, Fish came right back to break the Argentine's serve and set up the tiebreaker. Then at 4-4 in the tiebreaker, Fish pulled away with what had worked for him during the rest of the match — he hit three consecutive forehands for winners, then capped the match with an overhead.

Meanwhile, both Haas and Federer said they were disappointed he had to pull out of their match.

"I was playing my best tennis of the season, and was looking forward to playing Roger this afternoon," Haas said.

Federer said, "I am very sorry for Tommy as I was looking forward to another great match with him. We have played quite a few times, and I know and respect Tommy a lot. I hope he gets better quickly."