Video: Rafael Nadal hits Novak Djokovic in face with backhand

There was already enough tension at the Rogers Cup in Montreal on Saturday night as Rafael Nadal took on his old rival Novak Djokovic in the semi-finals.

However, the intensity was cranked up a notch during the deciding set when Nadal struck his opponent in the face with a backhand at the net.

Djokovic was far from impressed, and it got worse for the world number one as he went on to lose the match 4-6 6-3 6-7(2) against the Spaniard.

Watch the video below to see the Serbian take one in the chops from close range: