Somewhat of a rockstar coach, Mouratoglou has amassed a sizeable following on social media through his various platforms over the years. Even so, his bread and butter is coaching, and he's a big name in those circles.
Best known as the former coach of Serena Williams, Mouratoglou has since gone on to coach several other players, including Simona Halep, whose coach he still is. He also worked with Holger Rune as Halep remains suspended, and it's been quite a ride.
They worked together for nine months but recently elected to split as Rune's mother explained that there was a lot of clashing between the coaches in the team. Mouratoglou has now offered some words on the split, though he mostly wished Rune good luck in the future.
What a ride @holgerrune2003 ! In 9 months, winning Paris, playing final of Monte Carlo and Rome, winning Stockholm and Munich…. From 30 to no4 ATP. Unfortunately, all the stories have to come to an end. I took the utmost pleasure with you and I will always be your supporter. All @mouratoglouacademy stays behind you. Good luck my friend.
The split isn't quite shocking, as Rune has been in a funk for a while now. He hasn't looked very good since Wimbledon, though some of that has to do with the sickness that plagued him during the Hopman Cup, as well as some minor injuries.
The Dane didn't look healthy during his US Open match, and he kind of confirmed that he's been dealing with some stuff but didn't want to miss the event. It remains to be seen what he does in the coming weeks with Mouratoglou now out of the picture.
He amassed quite a lot of ATP points on the indoor swing late last year, and defending those will be a priority.