WATCH: Serena hits the practice court with Dimitrov

Despite a rough loss in the the Australian Open semifinals, Serena Williams doesn't seem to be backing down at all. The 23-time Grand Slam champion was out on the practice court with Grigor Dimitrov, who himself made the Australian quarterfinals.

"My practice partner is better than yours [goat emoji]," Dimitrov wrote when he shared footage on Instagram.

"Just a casual hit," Serena posted on her own account.

Venus Williams chimed in as well, commenting, "Omg are you guys hitting now? Where is my invite??"

Dimitrov, currently ranked No. 17, is expected to play the Acapulco ATP 500 in March. Serena, meanwhile, has been making just as many off-court fashion statements as on-court ones.