Talk about being a stuffed shirt! That’s former No. 1 player in the world Caroline Wozniacki having some fun during a recent exhibition match as she made an attempt to impersonate Grand Slam champion Serena Williams (inset) by rolling up some towels and squeezing them inside her tennis outfit.

The getup got a few laughs from the crowd in Sao Paulo, Brazil, but it didn’t help Wozniacki much on the court, as she lost to Maria Sharapova, 6-2, 7-6.