Dmitry Tursunov of Russia overcame 13 double-faults with the help of 15 aces and beat a cramping Marinko Matosevic of Australia 6-3, 4-6, 7-6 (4) Friday at the Citi Open to reach his second semifinal this season.
The 61st-ranked Tursunov made it to the semifinals at Washington's hard-court tournament for the first time since 2006. He will face No. 8-seeded John Isner or No. 16-seeded Marcos Baghdatis.
Andrea Petkovic of Germany got to the women's semifinals with a 4-6, 6-1, 6-3 victory over Paula Ormaechea of Argentina. Petkovic, a former top-10 player whose career was sidetracked by injuries, had lost three of her previous four matches before arriving in Washington.
The 64th ranked Petkovic will play No. 4 Alize Cornet or No. 5 Sorana Cirstea for a berth in the final.
