Top seed Marin Cilic of Croatia survived three match points in a third-set tiebreaker and beat Igor Sijsling of the Netherlands on Thursday to advance to the quarter-finals of the US National Indoor Championships.
Cilic won 7-6 (7/2), 3-6, 7-6 (9/7) in a match that lasted more than two-and-a-half hours.
Meanwhile, sixth-seeded Tommy Haas withdrew on Thursday, citing a respiratory problem that has plagued him all week. Haas’ departure means Feliciano Lopez of Spain advanced to the quarter-finals in a walkover.
Jack Sock defeated James Blake in a battle of wild-card entries from the US, 7-5, 6-4.
Cilic saved four break points in the 11th game of the third set to take a 6-5 lead. He squandered a match point with Sijsling serving at 5-6 in the third set.
Sijsling double-faulted on his third match point of the tiebreaker and lost when he netted a forehand from behind the baseline.
The win moved Cilic into the quarter-finals against fifth-seeded Kei Nishikori of Japan, who advanced with a 6-3, 6-3 victory over qualifier Donald Young of the US.
Also, Marinko Matosevic of Australia eliminated fourth-seeded American Sam Querrey 3-6, 6-4, 7-5. Querrey had saved one match point in the deciding game, but double-faulted to send the advantage back to Matosevic. After a long rally from the baseline, Querrey sailed a forehand long, giving the Australian a place in the last eight.
Also advancing were No. 7 seed Alexandr Dolgopolov of Ukraine, Denis Istomin of Uzbekistan and American Michael Russell.
Dolgopolov beat US qualifier Rhyne Williams 6-4, 4-6, 6-4; Istomin defeated former world No. 1 Lleyton Hewitt of Australia 6-1, 6-2; and Russell won 6-2, 6-4 over Lukasz Kubot of Poland.
Earlier in the women’s quarter-finals, top-seeded Kirsten Flipkens of Belgium was eliminated by Magdalena Rybarikova of Slovakia, the No. 7 seed, 6-7 (9/11), 7-5, 6-3.
Fourth-seeded Heather Watson of Britain also lost, 6-1, 6-2 to Stefanie Voegele of Switzerland.
That left Sabine Lisicki as the only player in the top half of the draw to move on to the semi-finals after she defeated eighth-seed Kristina Mladenovic 6-3, 6-3.
Voegele will play Marina Erakovic of New Zealand, a 7-5, 6-2 winner over Jamie Hampton of the US on Thursday, while Lisicki and Rybarikova will face off in the other match.