Serena Williams squeaks into Madrid semifinals

By JOSEPH WILSON | May 10, 2013 | 8:35 AM EDT

Serena Williams from the U.S. celebrates a point against Anabel Medina from Spain during the Madrid Open tennis tournament, in Madrid Friday, May 10, 2013. (AP Photo/Daniel Ochoa de Olza)

MADRID (AP) — Top-ranked Serena Williams overcame Anabel Medina Garrigues 6-3, 0-6, 7-5 on Friday to reach the Madrid Open semifinals.

Williams looked in trouble after failing to win a game in the second set and going 4-2 down in the third. But the defending champion broke the Spaniard's serve twice to pull out the victory.

Second-seeded Maria Sharapova plays Kaia Kanepi in a late quarterfinal.