It is a little over 4 years ago that Argentina’s Juan Martin del Potro won the 2009 US Open. Since then, every tennis Grand Slam has been won by one of the big four men in the game. That jinx was broken on Sunday, when Switzerland’s Stanislas Wawrinka defeated world’s no.1 men’s player, the irrepressible Rafael Nadal, 6-3, 6-2, 3-6, 6-3 in one of the strangest final in the history of the Australian Open tournament. Nadal suffered from spasmodic pain in his lower back towards the end of the first set, required frequent medical attention and continued in the match with a sub-par game.