Daniil Medvedev was eventually forced to retire from the China Open semifinals, but not before a code violation and a heated argument with the chair umpire.
Jannik Sinner booked his place in the Beijing Open final after a hard-fought 6-3, 4-6, 6-2 victory over Australia's Alex de Minaur in a thrilling semi-final.
Daniil Medvedev, who has been making headlines for all the wrong reasons lately, gave some insight into his love/hate relationship with tennis.
Carlos Alcaraz is yet to drop a set at the Japan Open and was in full flight in his quarterfinal on Sunday, defeating Brandon Nakashima 6-2 6-4.
Carlos Alcaraz and Jannik Sinner are slowly developing one of tennis' greatest rivalries.
A nightmare day unfolded for Team Europe at the Laver Cup as Team World took control, starting with Taylor Fritz upsetting world number one Carlos Alcaraz.