SINGAPORE -- In a day of upsets, American Michael Chang was the latest high-profile player ousted from the Heineken Open, losing in the second round to compatriot Jan-Michael Gambill 6-2, 7-6 (7-4).

"I didn't have a lot going my way," Chang said. "I feel like I played good tennis, it wasn't my day to get the breaks. I had my chances and I wasn't able to take advantage of them."

Gambill said playing against Chang in a quarterfinal in Shanghai last week for that city's Heineken Open helped him address parts of his game he was unhappy with.

"It was great playing last week, I fixed a lot of things I was doing wrong," Gambill said. "I'm moving better today, executing a lot better and served really well."

Gambill said Chang played like a warrior. "I really had to step up my game," Gambill said. "He's one of the most intense players."

Big-serving Australian Mark Philippoussis was also upset, 3-6, 7-5, 7-6, (8-6) by Croatian Ivan Ljubicic.

For the second-seeded Philippoussis, the disappointment was clear: "Lack of match play, going for the wrong shots on big points..

"I was up a set and a break. Even though I haven't played enough tournaments I would like to think I have enough experience not to lose matches like that," he said. "I should have won the match."

Philippoussis' next tournament is in Lyon, starting Monday. He said his coach and mentor, former Wimbledon champion Pat Cash, would join him in Stuttgart when he plays there later this month.

Ljubicic, on the other hand, rated his win over Philippoussis as one of the most memorable of his career, topping that of his victory over Russia's Yevgeny Kafelnikov earlier this year.

"This one I liked more because it was a very difficult match. Against Kafelnikov it was, like, less than an hour, and I didn't give him a chance to get in the match," Ljubicic said.

Australian Todd Woodbridge was ousted from the singles draw one day after doubles partner Mark Woodforde. Woodbridge was beaten by Dutchman John Van Lottum 6-4, 6-0.

"He played unbelievable," Woodbridge said of Van Lottum. "He gave me no free points. The score line did not show anything to say how the match was. I think the match was pretty tight."

Woodbridge said Van Lottum was a loose cannon whose game changes from day to day.

"Like a volcano. I was close to getting him to erupt but he hung on well," Woodbridge said.

Thailand's Paradorn Srichaphan reached the quarterfinals by downing Frenchman Anthony Dupuis 6-4, 6-1.

The 20-year-old top-ranked player in Asia said he was nervous coming into the match after defeating Shanghai winner Magnus Norman the day before.

"I tried to play my best, three quarters (quarterfinals) in a row, pretty good result for me," he said.

The tournament lost two of its top doubles pairs to injuries Thursday.

The top-ranked doubles team of Mahesh Bhupathi and Leander Paes of India pulled out of the tournament because Bhupathi has not fully recovered from a strain he received in the first round of doubles at Shanghai last week.

Americans Justin Gimelstob and Jack Waite advanced to the quarterfinal after third-seeded Sebastien Lareau of France and Canadian Daniel Nestor withdrew because of Nestor's shoulder injury.