The two former No. 1s prevailed in straight sets but not before weathering significant tests from their opponents.
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The second-ranked American man and second-ranked American woman met different fates at the Australian Open.
Serena Williams and Angelique Kerber cruised, Li Na escaped, Eugenie Bouchard broke through, and Ekaterina Makarova continued to shine.
Late men’s matches on Thursday offered plenty of drama, while Friday was more straightforward at the Australian Open.
The third-ranked man and fourth-ranked woman faced sterner resistance than the other top seeds at the Australian Open today.
The world No. 1 and the top-ranked German faced little resistance en route to the second week of the Australian Open.
Counting down the Australian Open men’s thrillers of the last two days, some with unlikely heroes.
Both halves of the sport’s greatest rivalry dominated opponents en route to the third round of the Australian Open.
Agnieszka Radwanska and Dominika Cibulkova cruised, while Caroline Wozniacki and Simona Halep fought hard to advance.
Roger Federer, Rafael Nadal, and Jo-Wilfried Tsonga cruised, but the best match of the day came from Donald Young and Andreas Seppi.