BBC Sport advent calendar - 18 December

Day 18 of BBC Sport's 2014 advent calendar sees Klara Koukalova hit doubles partner Monica Niculescu on 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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