Roger Federer and Tommy Haas play mini-tennis before their real match in Stuttgart.

Australia is renowned for its weird, wild and wonderful wildlife, and the players get to experience it in abundance. Whether it's at the zoo, in the aquarium, or under the lights of Rod Laver, the players at the Aussie Open have seen it all.

Caroline Wozniacki use some towels to imitate Serena Williams during her exhibition match against Maria Sharapova in Sao Paulo.

Renzo Olivo loses his grip on a serve but still wins the point against Thomaz Bellucci in Santiago.

Watch how Ivan Dodig knocked out Marcelo Melo in Miami's double.

Alexander Zverev had almost the job done on this rally against Frances Tiafoe and just had to conclude with an easy smash. But...