Federer surprises kids testing rackets
Roger Federer surprises a group of young tennis players who were testing rackets for Wilson and have no idea he is about to arrive.
Djokovic 'very grateful' for career
Novak Djokovic talks about what he values most about being the favorite at the US Open.
Serena first felt shoulder pain after Wimbledon title
Serena Williams talks about the shoulder injury that has been causing her problems since she won Wimbledon.