During two sets against Zidansek, Serena Williams was spotted nailing acrylic tips with a design of a koala on her ring finger’s nail. The tennis star has regularly expressed her concerns about the Australia wildfires and even posted a heartfelt note on January 9 that read, “I am heartbroken over the devastation of the wildfires in Australia. With the loss of over 500 million animals and many people left without their homes, we need to act now to help in whatever way we can. I have been going to Australia for over 20 years so this devastation is hitting me particularly hard.”