Juan Martin del Potro is back and feeling alive…

The 27-year-old Argentine tennis player registered a shock second-round win to knock fourth seed Stan Wawrinka out of the men’s singles at Wimbledon.

del Potro, a former US Open champion, secured a 3-6, 6-3, 7-6 (7-2), 6-3 win over Wawrinka.

He’s currently ranked No. 165 in the world after missing more than two years because of injury problems.

del Potro, who is in the same half of the draw as Britain’s Andy Murray, will next play France’s 32nd seed Lucas Pouille.

del Potro reached the semifinals at the All-England Club in 2013 but the former world number four is playing in his first Grand Slam since the Australian Open in 2014 after having three wrist operations.

He struggled early on as Wawrinka claimed an early break before comfortably taking the opening set, but del Potro fought back well to take the second.

Both players broke serve twice in the opening four games of a thrilling third set, which del Potro won in a tie-break, before taking the fourth set to wrap up victory.

“It feels amazing,” del Potro told BBC Sport. “I beat one of the guys who is playing great tennis this season and I couldn’t have expected this before today.

“I enjoyed the crowd, they were incredible and I’m very happy.

“It is my second or third career now after all the injuries. I was sad for the last two years and now I am enjoying playing tennis again. I feel alive.”