MELBOURNE, Australia (AP) — Novak Djokovic retires from his Australian Open semifinal after losing the first set against Alexander Zverev.

Herald newspaper reported Friday that Kokkinakis defied advice from Tennis Australia not to play in a St. Petersburg exhibition nearly two months ago.

Winning a Grand Slam at that time can never be considered as winning a Grand Slam in the Open era,” said Patrick Mouratoglou, as he reignited the GOAT debate on social media.