VIENNA, Austria -- Stanislas Wawrinka and Feliciano Lopez have both reached the quarterfinals of the BA-CA Tennis Trophy in Vienna.
Lopez, the 2004 winner, defeated home favorite Stefan Koubek to reach the Vienna last eight.
Wawrinka rallied to beat Argentina's David Nalbandian 5-7 6-3 6-1, while Lopez -- the 2004 winner -- defeated Austria's Stefan Koubek 6-4 3-6 6-4.
The pair will now face each other for a place in the last four.
Nalbandian, who had not played for more than a month since losing at the U.S. Open, led 5-3 but struggled to close out the first set.
In the second set, Wawrinka broke twice and used his third set point to even the match. Wawrinka used three breaks in the third to wrap up the victory.
Juan Ignacio Chela rallied to beat Jurgen Melzer 4-6 6-3 6-2, to reach the quarterfinals of a tournament for the 10th time this season.
Melzer trailed 3-1 before winning the first set, and then broke Chela in the first game of the second. But Chela dominated the Austrian after that with strong forehands from the baseline.
Meanwhile, Jarkko Nieminen and Mario Ancic won their second round matches in straight sets to reach the quarterfinals of the Stockholm Open.
Nieminen, a two-time finalist in the indoor tournament, won eight straight games en route to a 6-0 6-4 victory over Peter Luczak, while Ancic beat Bjorn Rehnquist 6-1 6-3.
Nieminen, who has lost just seven games in his first two matches, faced six break points during the match and saved them all. In the first set, the Finn lost only eight points.
"It feels very good to win," Nieminen said. "I was the favorite in this match, and lost only a few games. I played the first set almost perfectly."
Nieminen, seeded sixth, will play either top-seeded James Blake or Frank Dancevic in the quarters. Last year, Nieminen lost to Blake in the final.
Ancic, playing only his fifth tournament since February, never faced a break point against the 306th-ranked Rehnquist, who got into the main draw as a lucky loser after the qualifying event. E-mail to a friend