Briton Jack Draper reached the last 16 of the Adelaide International 2 but compatriot Dan Evans was knocked out in straight sets.
Briton Kyle Edmund faces Serb Miomir Kecmanovic later on Monday.
In the women's event, 2022 Australian Open finalist Danielle Collins beat Karolina Pliskova 6-2 6-4.
And in a battle between current and former Wimbledon champions, Kazakhstan's 2022 winner Elena Rybakina lost 6-3 7-5 to Czech Petra Kvitova.
There are two ATP-WTA Adelaide Internationals this month as players gear up for next week's Australian Open, with Novak Djokovic and Aryna Sabalenka winning the titles in week one.