LONDON (Reuters) - Men's number two seed Novak Djokovic struggled into the Olympic quarter-finals on Wednesday with a hardfought 4-6 7-5 6-1 win over world number 158 Australia's Lleyton Hewitt.
World number one Roger Federer also faced a shaky moment against Uzbekistan's Denis Istomin, saving three break points at 5-5 in the first set before securing his spot in the final eight with a 7-5 6-3 win.
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