Black Tennis Pro's

Tokyo (AP) -- Defending champion Dinara Safina and Venus Williams were knocked out of the second round by qualifiers at the Toray Pan Pacific Open on Monday.

Chang Kai-chen, an 18-year-old from Taiwan, upset the top-ranked Safina 7-6 (5), 4-6, 7-5. Russian teenager Anastasia Pavlyuchenkova edged Williams 7-6 (6), 7-5 to reach the third round.

Safina was serving for the match in the third set when she double-faulted to give up a break. Chang, ranked 132nd and playing only the fourth time in a WTA main draw, held her serve and broke Safina again for victory.

“The double-fault didn't affect me that much,” Safina said. “Whether it's a double-fault or a mistake it's the same. It's just the way I played at 5-4. It wasn't the right game, I didn't use my first serve the whole game.”

A dejected Williams made a hasty exit from Ariake Colosseum, saying only she was looking forward to her next match in Beijing.

Williams took a 3-0 lead in the first set but the 18-year-old Pavlyuchenkova fought back, breaking Williams to tie it 5-5 before holding serve and winning the tiebreak.

Pavlyuchenkova hit a forehand down the line to go up 6-5 in the second set. She had a triple-match point in the 12th game and won when Williams' return was long.