Stanislas Wawrinka produced an outstanding performance to beat Andy Murray in the quarter finals at New York, with the Swiss number two now looking to produce another upset by beating Djokovic.
It is not the biggest long shot in the world when you consider that Wawrinka ran the Serbian close in the 2012 US Open where he produced a set and a half of unplayable tennis before his opponent gradually wore him down.
“It’s not easy but I knew that he has a killer instinct,” coach Magnus Norman told BBC Radio 5 live.
“He’s shown in the past, on and off, that he has it. It’s a little bit a matter of self-belief and having a good team around him that he believes can take him to the next level.
“Then of course it’s a lot of hard work. Day in and day out you have to speak about these things, because it still doesn’t come naturally to Stan. He still doesn’t really believe in himself 100% all the time”.
The Swiss is a 7/2 chance with bet365 to reach his first Grand Slam final, although Djokovic might be encouraged by the prospect of not having to play Murray at this stage ahead of a potential final showdown against an in-form Nadal.
The Spaniard is absolutely flying and made short work of Tommy Robredo in his quarter final match, with the bookies now going even money that Nadal adds his second Grand Slam title of 2013 following yet another French Open success.
The world number two is no bigger than 1/18 with BetVictor to beat Richard Gasquet, with many punters looking to back a Nadal straight sets victory and that can be backed at odds of 4/9 with Sky Bet.