Puig proving 'nothing is impossible'

Monica Puig talks about winning gold in the Rio Olympics for women's singles and is glad to remind the people of Puerto Rico that "nothing is impossible."

0:41

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.

1:14

Djokovic 'very grateful' for career.

Novak Djokovic talks about what he values most about being the favorite at the US Open.

2:07

Kerber is not talking about possible No. 1 ranking.

Angelique Kerber talks about the pressure she felt trying to win Cincinnati, and also take the No. 1 ranking away from Serena Williams.

0:39

Muguruza feels stronger and more experienced than ever.

Garbine Muguruza talks about her chances at the US Open and who may stand in her way.

0:48

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.

0:44

Nishikori: I've had a lot of special moments at the US Open.

Kei Nishikori reflects on some of his recent performances at the US Open.

0:33

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