US Open 2018: The four main contenders for the title at Flushing Meadows

Stan Wawrinka

Stan Wawrinka holding the 2016 US Open title

Stan Wawrinka may have fallen at the semi-finals at Cincinnati, but he brought smiles to the faces of fans worldwide, as the world saw glimpses of the old Wawrinka. The former US Open champion put in a good showing at the Rogers Cup, where he competed valiantly against Rafael Nadal before losing in two tight sets.

The most significant improvement in Stan's game over the past couple of months has been his movement. From the start of this year to the grass court-season, Wawrinka looked a mere shadow of his former self as the knee injury looked to have taken its toll on the former French Open champion. Sharp movement allows a player to get into position to hit the shots they want, especially for someone like Wawrinka who plays so aggressively.

The 33-year-old also has experience of winning in New York, after securing the 2016 US Open title and the third major of his career. Victory at Flushing Meadows would be one of tennis' most remarkable comebacks, given his recent injury struggles and his absence from last year's tournament.