Australian Open 2023 LIVE updates: Karen Khachanov takes first set against Sebastian Korda, Elena Rybakina defeats Jelena Ostapenko, Jessica Pegula, Stefanos Tsitsipas later

The quarter-finals at the Australian Open begin today, with Jelena Ostapenko, Jessica Pegula and Stefanos Tsitsipas among the key players aiming to go deep into the second week at Melbourne Park.