NEW YORK (AP) — Serena Williams took a medical timeout because of a problem with her right foot, and later double-faulted on the last two points as she and sister Venus lost in the doubles quarterfinals at the U.S. Open.
The Williams sisters, owners of 13 Grand Slam doubles titles, were beaten 7-6 (5), 6-4 Tuesday by the fourth-seeded Russian duo of Ekaterina Makarova and Elena Vesnina.
Serena's serve was broken early in each of the first two sets, and then again in the final game.
She and Venus are 4-3 in doubles in 2014, with two of the losses against Makarova and Vesnina.
Serena and Makarova could face each other again in the singles semifinals. They play their quarterfinal matches in that event Wednesday.