Watch Angelique Kerber suffer her first defeat as world number one, in three sets against Petra Kvitova at the Wuhan Open.
Highlights: New No.1 Kerber loses in China
Stephen A. says Serena's poise is unlike anything he's ever seen
Tiafoe shows amazing resilience to win point
Serena's impact is different from other athletes
Nadal: Just trying to get back to 100%
Serena at 35 vs. sporting greats
Highlights: Wozniacki wins second Tokyo title
Kerber aiming to be at top for 'as long as possible'
Wawrinka wins first US Open title
Wawrinka's emotional championship speech
Djokovic gracious in defeat
Djokovic blasts backhand down the line past Wawrinka
Djoker gets early break in final
Djokovic flashes brilliance to win point
Wawrinka's cross-court volley ends incredible rally
Wawrinka hits slick drop shot
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