27 June 2014 Last updated at 12:48

Wimbledon 2014: Doubles server smashes partner in head

Klara Koukalova hits doubles partner Monica Niculescu in the back of the head with her serve at Wimbledon.

The Czech then comforts her distressed Romanian partner after she is forced to sit down following the shock during their game against Spanish duo and Garbine Muguruza and Carla Suarez Navarro.

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