Reigning Roland Garros champion Stan Wawrinka isn't suffering an identity crisis after celebrating his 31st birthday yesterday.

Wawrinka has earned his place as world No. 4, but does not regard himself as part of the Big 4.

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The Grand Slam achievements of the Big 4—Novak Djokovic, Roger Federer, Rafael Nadal and Andy Murray—make them a legendary group. While the Swiss insists he's not part of that major quartet, he knows he can beat them all "because I've already done it."

"It’s not an inferiority complex – I just know my place. I’m No. 4 in the world, so obviously one of those four has gone down in the rankings.," Wawrinka told the official Roland Garros website. "But they got that nickname based on what they had achieved. It’s part of their shared history and you can’t rewrite history. I’m not trying to be part of the group.

"I've been in the top 4 or 3 for two years now, I’ve won two Grand Slams, during that time Nadal has won one, Federer and Murray none and Djokovic has cleaned up the rest. My place is there, but I’ve no intention of messing with that particular legend. I’m not one of the Big Four. But I know that I can beat any one of them at the big tournaments. I know that for a fact, because I’ve already done it."

The eighth-seeded Swiss doubled the top-ranked Djokovic's winner output (60 to 30) snapping the Serbian's 28-match winning streak with a stunning victory in the Roland Garros final last June.

"It was a feeling of completeness—the like of which only comes along rarely, so to get it during a Grand Slam, in the final, against the world No.1 who had been sweeping all before him for months on end—that was incredible!" Wawrinka told the Roland Garros website. "Tennis is an extreme sport in terms of emotions, both positive and negative, and you can’t compare the feeling with anything on earth when you manage to play your very best at such a crucial moment."

Photo credit: Christopher Levy