ATP Atlanta - Mardy Fish twists ankle and retires after leading against Muller

It was not a good day for the veteran American men at the BB&T Atlanta Open on Thursday.

Former world no. 4 James Blake was beaten by Aussie Matthew Ebden in the second round.

Ebden hit 20 aces in the 6-7(6), 6-4, 6-4 win over Blake.

World No. 82 Ebden next takes on Luxembourg’s Gilles Muller for a palce in the seme finals. Muller advanced when another veteran American Mardy Fish made an exit.

Second seeded Fish was forced to retire from their match midway through the second set.

Fish led Muller 6-4, 2-2 before injuring hurting his left ankle.

Fish held for 3-2, but was unable to continue after that and retired to let Muller advance.

Also through to the quarter finals was 19-year-old Jack Sock, who beat two-time NCAA singles champion Steve Johnson 7-6(5), 7-5(5). Sock could meet top seed John Isner next.