In a tournament that has been historically low on upsets through to the quarter-finals, perhaps the most dramatic moment of the Australian Open so far came as defending champion Jannik Sinner began to buckle under the full weight of the Melbourne sun.
With temperatures hitting 40C, Sinner was battling Eliot Spizzirri in the third set of their third-round clash when the second seed began to cramp. Sinner was shaking off his legs and stretching his hands and looked in serious trouble as he went down a break to the American.
