WATCH: Nadal bangs his head in Wimbledon tunnel before losing first set

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Rafael Nadal has not taken many blows this year but the legendary Spaniard suffered two in quick succession at Wimbledon on Monday.

Nadal claimed his 15th grand slam title at the French Open to complete a sensational 'La Decima' - his 10th triumph at Roland Garros - last month.

The world number two has been in ominous form at the All England Club, easing through the first three rounds without dropping a set.

It has not gone smoothly for the two-time Wimbledon champion at the start of the second week, though, as he banged his head when jumping in the tunnel before going out to face Gilles Muller on No.1 Court.

The exuberant Nadal laughed off an embarrassing moment, which was caught on camera, but he was not smiling when Muller took the first set 6-3.