Roger Federer is nothing but vulnerable on the tennis court these days. With three straight setbacks against lowly opponents, it is hard to imagine the Maestro recapturing back his old dominant form. One thing is for sure, Federer's struggle is not just a slump, it's a battle to stay relevant, and sadly, he's losing it on each passing day.

For all the record breaking feats and great tennis moments Federer delivered in the sport, it's increasingly becoming apparent that the time has come for the Swiss to bid his goodbye. Federer has done a lot for tennis and these are just enough to secure his place as the greatest player who ever wielded a racket.

Seventeen Grand Slam titles, 77 singles career singles title, 302 weeks as world's no.1, and the list goes on. These hardware and records might be the evidence of Federer's superb tennis excellence, but that's not the thing that separated him from past and current champions.

Novak Djokovic looks poised to keep the top on the ATP Rankings for a long while, while Andy Murray seems to have found the formula to win more Wimbledon Championships. At 27, Rafael Nadal is still very much capable of surpassing Federer's Grand Slam haul and career titles. But even though they are able to break the Swiss' record down the road, they will never be greater than him.

Throughout his career, Federer developed a reputation as humble-and-class champion. A kind of athlete endeared and loved by millions of fans around the world. Like in basketball, LeBron James might win more than six championships and MVP trophies, but he will never surpass Michael Jordan's greatness. Jordan transformed the game of basketball from America's favourite past time to a deep-seated religion.

Federer can now walk away from the sport he dominated and loved for his entire life because whatever happens next, Federer will always stand out as the true champion of champions.