Andre Agassi has called out Jannik Sinner for his 'flawed' French Open preparation.
What happened at the French Open?
Jannik Sinner, the World number one, was defeated in the second round by Juan Manuel Cerundolo.
The match was played in sweltering heat, with Sinner holding a two-set and 5-1 lead before Cerundolo completed a dramatic turnaround to win 3-6, 2-6, 7-5, 6-1, 6-1.
Why did Sinner struggle with the heat?
Andre Agassi told TNT Sports that Sinner needs to change his approach to dealing with heat.
Agassi had a body clock of about four hours when he played, and if he was given hot conditions it dropped to about three hours 45.
What does Agassi think Sinner should do?
Agassi believes Sinner may need to bring somebody in to help with his hydration and preparation.
He suggested that Sinner's intake of water and protein may not be sufficient, citing his own experience of drinking 10 to 12 litres of water within 24 hours of a match.
Sinner had played for five-and-a-half hours in the final against Carlos Alcaraz last year, but Agassi questioned why he couldn't last longer in the heat.
The French Open final will now be between Flavio Cobolli and Alexander Zverev.
Agassi's comments come after Sinner played down the impact of the heat, but admitted he ran out of energy.
Sinner took a medical time out in the third set, where he could be heard saying that he felt dizzy.
Agassi's experience and insight into the game make his comments significant, and Sinner would do well to take his advice on board.