Rafael Nadal takes on Roger Federer for their 26th career meeting on Tuesday at the ATP World Tour Finals in London. Nadal leads the head-to-head 17-8 and downed Federer the last time the two greats met in the 2011 French Open final. Join Courtney Nguyen for a live chat during the match, set to start at 3:00 p.m. ET.
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