MEMPHIS, Tennessee — Top seed Marin Cilic saved three match points en route to a 7-6 (7-2), 3-6, 7-6 (9-7) victory over Igor Sijsling Thursday to book a quarterfinal berth in the US Indoor Tennis Championships. Croatia's Cilic trailed 4-6 and then 6-7 in the third-set tiebreaker, but won the final three points to take the match from his Dutch foe. Cilic next faces Japanese fifth seed Kei Nishikori, who beat qualifier Donald Young 6-3, 6-3. World No. 63 Denis Istomin reached his fourth ATP quarterfinal of the season, beating Australian veteran Lleyton Hewitt 6-1, 6-2. Istomin next faces lucky loser Michael Russell, who beat Lukasz Kubot of Poland 6-2, 6-4. In women's action in this $1.58 million combined ATP and WTA event, top seed Kirsten Flipkens fell prey in the quarterfinals to the upset bug that saw second-seeded Sofia Arvidsson ousted in the second round. Seventh-seeded Slovak Magdalena Rybarikova, the winner of this title two years ago, defeated Flipkens 6-7 (11-13), 7-5, 6-3. In the semifinals, Rybarikova will take on third-seeded German Sabine Lisicki, who cruised past eighth-seeded Kristina Mladenovic of France 6-3, 6-3. The other semifinal will pit Switzerland's Stefanie Vogele against Marina Erakovic. Vogele beat Briton Heather Watson 6-1, 6-2, and New Zealand's Erakovic beat American Jamie Hampton 7-5, 6-2. Del Potro, Simon advance In France, defending champion Juan Martin del Potro beat Michael Llodra 3-6, 7-6 (4), 7-5 to reach the Open 13 quarterfinals Thursday. Del Potro hit 14 aces and saved nine of the 10 break points he faced as he was pushed all the way by the veteran Frenchman in a rematch of last year's final. The 2009 US Open champion faces another Frenchman, Gilles Simon, in the last eight after he advanced to his third straight quarterfinals with a 6-3, 6-1 win against Roberto Bautista-Agut, although Simon's serve was again not at its best. He broke his Spanish opponent seven times, but conceded three breaks of his own. Meanwhile, Russian qualifier Dmitry Tursunov also advanced after he upset fourth-seeded Janko Tipsarevic 7-6 (4), 6-2. Tursunov next plays Gilles Muller of Luxembourg. Seventh-seeded Jerzy Janowicz of Poland beat Frenchman Julien Benneteau 7-6 (0), 6-3, setting up a quarterfinal with top-seeded Tomas Berdych of the Czech Republic. Ferrer defeats Nalbandian In Argentina, top-seeded David Ferrer of Spain outlasted hometown favorite David Nalbandian in three sets Thursday to reach the quarterfinals of the Copa Claro in the Argentine capital. Ferrer, the defending champion and No. 4 in the ATP rankings, won 2-6, 6-4, 6-0 and will face Fabio Fognini of Italy in the quarterfinals Friday. Nicolas Almagro of Spain also advanced, beating Andrey Kuznetsov of Russia 7-6 (5), 6-2. Almagro faces Federico Delbonis of Argentina in the next round. — Agencies
