Novak Djokovic now stands on equal footing with Roger Federer.
Hall of Famer quarantining in Doha.
Adelaide champion joins Ash Barty, Simona Halep and Bianca Andreescu in withdrawing.
Roger Federer sent fans' hearts racing with one shot.
"My heart is no longer there to travel and play in these conditions," says Gilles Simon.
Tune into love holds for a five-minute break down on the day's top tennis stories.
The Spaniard sacraficed his body to lock up a game late in the third set against Egor Gerasimov.