Wawrinka will take time out to recover after his shock exit
Stan Wawrinka will take time away from the game to try to cure his left knee problem after crashing out of Wimbledon in the first round.
On a day when Andy Murray and Rafael Nadal breezed into round two, fifth seed Wawrinka was the victim of the opening day's big upset, losing 6-4 3-6 6-4 6-1 to Russian Daniil Medvedev.
A left knee issue Wawrinka thought was behind him flared up on the grass and he looked uncomfortable throughout his Centre Court ordeal.
The 32-year-old said: "It's not something new, but something I had in the past, the end of last year and also in Australia.
"Since I had that problem, this was the first time I've played on grass. Apparently grass is not the best surface for my knee.
"I need to figure out exactly what the problem is now, what I'm going to do, and come back on the tennis court when I am without any pain."
Wimbledon is the only Grand Slam that Wawrinka has yet to win, with the Swiss never making it past the quarter-finals.
He said: "I wasn't feeling the way I wanted to feel. But I played against a great player who I think was confident, was playing well, was playing fast."
Medvedev was playing in only his third Grand Slam and this was a first victory at this level for the 21-year-old.
He knelt down to kiss the grass after clinching the biggest win of his career and said: "I'm just really happy, my first Grand Slam win, Centre Court of Wimbledon.
"Even one year ago I was 250 in the rankings, if someone had told me I would play on Centre, let alone win, I would say you are joking.
"I have had a really great grass-court season, I knew Stan had some problems at Queen's so I knew I would have my chance.
"It's my favourite tournament, my first Grand Slam win, so I had to kiss the grass even though people do it when they win Wimbledon, not just one match."