W Debate: Will Serena Williams Or Roger Federer Give Us Another Thrill At US Open?
Updated: August 19, 2014, 1:25 PM ET
They're both coming off wins and they both have 17 Grand Slam titles, but who is more likely to make it 18 at the US Open, Serena Williams or Roger Federer? Susie Arth and Matt Wilansky smack it around.
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