ATP/WTA

U.S. NATIONAL INDOOR CHAMPIONSHIPS

At Memphis, Tenn.

Surface: Hard-Indoor

Singles

Men

Second Round

Denis Istomin, Uzbekistan, def. Lleyton Hewitt, Australia, 6-1, 6-2.

Alexandr Dolgopolov (7), Ukraine, def. Rhyne Williams, United States, 6-4, 4-6, 6-4.

Marin Cilic (1), Croatia, def. Igor Sijsling, Netherlands, 7-6 (2), 3-6, 7-6 (7).

Kei Nishikori (5), Japan, def. Donald Young, United States, 6-3, 6-3.

Marinko Matosevic, Australia, def. Sam Querrey (4), United States, 3-6, 6-4, 7-5.

Women

Quarterfinals

Sabine Lisicki (3), Germany, def. Kristina Mladenovic (8), France, 6-3, 6-3.

Magdalena Rybarikova (7), Slovakia, def. Kirsten Flipkens (1), Belgium, 6-7 (11), 7-5, 6-3.

Stefanie Voegele, Switzerland, def. Heather Watson (4), Britain, 6-1, 6-2.

OPEN 13

At Marseille, France

Surface: Hard-Indoor

Singles

Second Round

Dmitry Tursunov, Russia, def. Janko Tipsarevic (4), Serbia, 7-6 (4), 6-2.

Gilles Simon (6), France, def. Roberto Bautista-Agut, Spain, 6-3, 6-1.

Juan Martin del Potro (2), Argentina, def. Michael Llodra, France, 3-6, 7-6 (4), 7-5.

WTADUBAI DUTY FREE CHAMPIONSHIPS

At Dubai, United Arab Emirates

Surface: Hard-Outdoor

Singles

Quarterfinals

Roberta Vinci, Italy, def. Sam Stosur (7), Australia, 6-2, 6-4.

Sara Errani (5), Italy, def. Nadia Petrova, Russia, 6-4, 0-6, 6-3.

Caroline Wozniacki (8), Denmark, def. Marion Bartoli, France, 4-6, 6-1, 6-4.

Petra Kvitova (6), Czech Republic, def. Agnieszka Radwanska (3), Poland, 6-2, 6-4.