DEN BOSCH, Netherlands - Defending champion Ivan Ljubicic was ousted by Viktor Troicki of Serbia 5-7, 6-4, 7-6 (5) in the second round of the Ordina Open on Wednesday.
Ljubicic had 25 aces and lost his serve only once, but in the third-set tiebreaker he squandered a 3-0 lead and dropped five straight points.
"In the tiebreak I thought I had a chance but I didn't find the weapons to finish it off," said Ljubicic, who was seeded fourth.
Troicki was through to his first quarter-finals since last July at Umag, where he beat Novak Djokovic en route to the semifinals.
"It was a great match, I played well and I'm happy that I won," Troicki said. "It was tough to break each other."
In the quarter-finals, Troicki will face seventh-seeded Guillermo Canas, who beat Rohan Bopanna of India 6-2, 6-4.
Also, Arnaud Clement of France beat Marcel Granollers of Spain 6-7 (6), 6-3, 6-3, and Juan Martin Del Potro of Argentina beat Rainer Schuettler of Germany 7-6 (3), 7-6 (5).
In the women's event, top-seeded Elena Dementieva of Russia beat Sara Errani of Italy 6-3, 7-5.
Local favourite Michaella Krajicek overpowered Sania Mirza of India 6-2, 6-2, and seventh-seeded Katarina Srebotnik of Slovakia beat Chan Yung-jan of Taiwan 6-4, 6-3 but injured her left ankle and had to withdraw from the tournament. That advanced third-seeded Dinara Safina to the semifinals.
Tamarine Tanasugarn beat Ashley Harkleroad of the United States 4-6, 6-4, 7-5 to reach her first quarter-finals since February at her home event in Pattaya City, Thailand, and set up a last-eight match with Krajicek.
Sorana Cirstea of Romania defeated Mariya Koryttseva of Ukraine, 7-6 (3), 6-4 and faces Dementieva next.