The war of words has started before their big French Open last-16 match - but with new Australian recruit Daria Kasatkina and her young friend Mirra Andreeva, the trash talk has nothing to do with tennis.
It's all about the pair's 'vlogging' talent with the two of them delighted to wind each other up over their respective skills behind the camera and on the mike when they're working on Kasatkina's popular YouTube channel "What the Vlog".
Giving its viewers an entertaining inside peek at the tennis scene, Kasatkina, who set up the channel with her figure skater girlfriend Natalia Zabiiako, has given her fourth-round opponent Andreeva the chance to film the odd item for them too.