Top-seeded David Ferrer withdrew from his Mexican Open quarterfinal against South Africa*s Kevin Anderson in the second set Thursday with a left leg strain.
Third-ranked Ferrer was leading 6-4, 2-2 when he suffered an inner thigh strain in his left leg. After seeking treatment in the locker room, the Spaniard returned to the court but lost the next two points before retiring.
Ferrer said he will have an MRI on Friday and then assess the extent of the injury.
Anderson will next play Ukraine's Alexandr Dolgopolov, who defeated Ivo Karlovic of Croatia, 6-4, 7-6 (4).
On the women*s side of the tournament, top-seeded Dominika Cibulkova of Slovakia, defeated New Zealand's Marina Erakovic to move into the semifinals.