Former world number one Serena Williams has advanced to the quarter-finals of the Top Seed Open.
She came from a set down to beat her sister Venus 3-6, 6-3, 6-4.
"It was a high-quality match, Venus is playing really, really good," said Serena. "She was running me around a lot, and then at one point it was just big serves, then we were both returning really well. It was really good.
"I honestly don't know how I was able to pull it out at the end," she concluded.
Serena next faces American wild-card entry Shelby Rogers, who defeated Canadian qualifier Leylah Fernandez 6-2, 7-5.
Meanwhile, Jil Teichmann advanced to the quarterfinals after crushing No. 5 seed Yulia Putintseva 6-2, 6-2. She will next play CiCi Bellis, who secured a 6-3, 6-2 win over Jessica Pegula.
World number two Iga Swiatek advanced to the second round of the Australian Open on Monday with an unconvincing 6-3 6-4 win against first-time opponent Katerina Siniakova on John Cain Arena.
Jannik Sinner launched his Australian Open title defence with a 7-6 7-6 6-1 win over Nicolas Jarry on Monday in a match that put the players' contrasting doping cases in the spotlight, while Carlos Alcaraz began his bid to complete a career Grand Slam with a 6-1 7-5 6-1 win over Kazakh Alexander Shevchenko.
Manchester United boss Ruben Amorim said his team are still improving, as Sunday's dramatic FA Cup penalty shootout victory over Arsenal points to a more positive future after a difficult start to life at Old Trafford.