Stan Wawrinka confident of stopping Fed Express at US Open

Stan Wawrinka believes he is one of the few players that makes Roger Federer nervous as the Swiss duo prepare to do battle in the US Open semi-finals.

Federer is yet to drop a set in five matches at Flushing Meadows, where he has continued his recent renaissance with a series of dazzling displays.

Richard Gasquet was the latest opponent to be blown away on Thursday and of the four men left in New York, Federer now tops the tournament table for winners (26%), return winners (15), first serves in (65%) and service games won (97%).