Rafael Nadal labours through third round of US Open

A semi-final between Rafael Nadal and Roger Federer at the US Open continued to look a long way away as the Spaniard followed his rival in labouring into the third round.

Federer has been taken to five sets in both his first two matches at Flushing Meadows, with the night session on Thursday delayed by his latest struggle against Mikhail Youzhny.