Djoko survives; Federer in QF

Novak Djokovic had to dig deep to avoid a shock Olympic exit as the world number two fought back to defeat Australia's Lleyton Hewitt 4-6, 7-5, 6-1 in the third roundu00a0yesterday.

Djokovic was pushed to the brink in a gruelling clash on Centre Court before finally overpowering the gritty Hewitt in one hour and 56 minutes.

Meanwhile, Roger Federer moved into the Olympic Games quarter-finals with a 7-5, 6-3 win over Uzbekistan's Denis Istomin. u00a0