Serena Williams has endorsed a new Netflix movie about her coach, Patrick Mouratoglou, and said she was ‘proud’ of him in a recent social media post.

The Playbook profiles legendary coaches as they share the rules they live by to achieve success in sports and in life.

“Proud of you Patrick Mouratoglou. Your story on Netflix’s The Playbook is inspiring. It’s incredible how you always push me to get more out of myself. I’m so happy I made that phone call. This is a must-watch,” Williams wrote on Instagram.

Mouratoglou responded to Serena Williams’ post in which the movie is praised: “Thanks a lot Serena for your support! That is a crazy ride!”

Mouratoglou’s story aired on Netflix on September 22.

Patrick Mouratoglou , 2nd left, at Wimbledon watches on a Coco Gauff wins her match. Photo Roger Parker International Sports Fotos Ltd