Mouratoglou advised Williams to lose weight for improved tennis performance, especially after her pregnancies, citing concerns about movement and injury risk.
He clarified that his advice was solely focused on her athletic ability, not her appearance, despite Williams initially feeling judged.
Williams recently disclosed that she used a GLP-1 medication to lose 31 pounds, which she says has made her feel healthier and more active.
Mouratoglou suggested that if Williams had achieved this physical condition earlier, her on-court results would have been superior.