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John Isner, coach Justin Gimelstob part ways

John Isner and coach Justin Gimelstob are parting ways after more than a year of training together.

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John Isner and coach Justin Gimelstob are parting ways after more than a year of training together, the pair announced on Gimelstob’s website on Monday.

“After an incredibly enjoyable year and a half coaching one the best talents in the sport, John and I have decided to end our professional relationship,” Gimelstob wrote. “I’m very proud of what John has accomplished and I wish him the best moving forward. I have every confidence John’s best tennis is ahead of him and he will achieve great things the rest of his career.”

Gimelstob cited personal challenges as his reason for ending his coaching relationship with Isner. The former professional player and current Tennis Channel analyst was hired by Isner in December 2014.

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“Unfortunately, I am experiencing some very challenging times in my personal life and thus need to prioritize quality time with my son, along with focusing on my responsibilities with the ATP World Tour and Tennis Channel.  I will always be thankful for the opportunity to coach such an accomplished player, but more importantly such a quality person. John has an incredible team and support system around him, and being a part of that special group will be amongst what I will miss most. I wish John all the best, and look forward to cheering him on and supporting him for years to come.”

Isner, who is currently No. 15 in the ATP rankings, thanked Gimelstob in a statement of his own.

“I am disappointed to no longer be working with Justin, but fully understand his decision and his need to spend as much time with Brandon as possible,” Isner wrote. “I am very appreciative of all his help and know I am a much better tennis player in every way after the time we have spent together. I will always be thankful for Justin’s guidance and unmatched knowledge and enthusiasm for the game. I know we will remain close friends and I will always count on his support throughout the remainder of my career.”

Isner lost in his opening match at the Miami Open to fellow American Tim Smyczek.