Wozniacki has the ultimate bad hair day

She's as famous for her good looks and flowing blonde hair as her on court proficiency.

But Danish tennis beauty Caroline Wozniacki found the downside of her long locks in what can only be described as the ultimate bad hair day at the US Open.

In a comical incident, the world No. 10 was left all tied up when her ponytail became tangled mid-point against Belarusian Aliaksandra Sasnovich.

Wozniacki missed the return to lose the point but at least won the match - 6-3, 6-4.