Andy Roddick looks on during his match against Lleyton Hewitt.
© Mark Kolbe/Getty Images
MELBOURNE, Australia (AP) -- Andy Roddick has retired after three sets of his second-round match against Lleyton Hewitt at the Australian Open.
Australian wild-card entry Hewitt was leading the contest between two former No. 1-ranked players 3-6, 6-3, 6-4 on Thursday night when Roddick called for the doctor and trainer in the break after the third set.
Roddick had fallen to the court during the first set, but continued despite being in obvious pain. The nature of Roddick's injury was unclear.
Hewitt, who has won two major titles and was a finalist here in 2005, will play Canada's Milos Raonic in the third round.