Del Potro stuns Wawrinka

Juan Martin del Potro sent Swiss fourth seed Stan Wawrinka crashing out of Wimbledon on Friday with a 3-6, 6-3, 7-6 (7/2), 6-3 victory in the second round.

The world number 165 from Argentina, who was a semi-finalist in 2013 in what was his last appearance at the tournament, next faces French 32nd seed Lucas Pouille.

Del Potro is playing in his first major since the Australian Open in 2014 after undergoing three wrist surgeries.

"It feels amazing, it's a great sensation," said the 27-year-old.

"I enjoyed the crowd. It's an incredible feeling, that's why my hands are still shaking.

"I feel alive again. After sitting at home for two years, this feels like a second or third career," added the former world number four.

On a wet day at Wimbledon, with only Centre Court matches being played relatively uninterrupted because of the retractable roof, defending champion Serena Williams survived a scare from fellow American Christina McHale, eventually winning a fiercely fought encounter 6-7 (7), 6-2, 6-4 to go into the third round.

It was a day of hard-earned success for both the Williams sisters as five-time champion Venus Williams  reached the last-16, seeing off Russian teenager Daria Kasatkina 7-5, 4-6, 10-8 in a tie featuring a rain stoppage when she held match point.

In another rain-interrupted encounter, Australian Nick Kyrgios survived a warning for bad language and a third-set sulk to clinch a 6-7 (3), 6-1, 2-6, 6-4, 6-4 victory over Dustin Brown of Germany in an explosive second-round clash. Both players are known for their entertaining styles and they did not disappoint with a five-setter replete with quality shot-making.

Kyrgios, who famously shocked Rafael Nadal en route to the Wimbledon quarter-finals two years ago, spent most of the match ranting, drawing a code violation for an audible obscenity and appearing to give minimal effort in protest as he sulked his way through the third set against the man who shocked Nadal last year.

Hammering aces and winners with abandon, it took Brown and Kyrgios just one hour and 40 minutes to reach a fifth set. Kyrgios lost his temper again in the decider over more debatable line-calls, but in between the theatrics he finally came out on top.