Tsitsipas, currently ranked as the world's number five player, explained that the reason behind the split stemmed from the challenges posed by having two coaches present on the court. As a result, the 24-year-old Greek decided to conclude his coaching collaboration with Philippoussis and continue working with his primary coach, his father Apostolos Tsitsipas.
"It's never easy having two coaches on the court. I know they are there to help and give the best they can, and provide for me," Tsitsipas told reporters.
"But sometimes it can get quite kind of hectic having two coaches share opinions. I'm at a phase of my career in life where I need one coach that can provide all the information, all the analysis, all of the things that I'm looking for to improve my game. Less is more, in my opinion."
"It is very important to stick with few people, in my opinion, and make that work, because when you have a lot of people around you, it can get very draining for your mental energy, too."
Philippoussis, 46, was a finalist at the U.S. Open in 1998 and at Wimbledon in 2003.