Surprise names for best servers of all time according to Patrick Mouratoglou led by John Isner

Retired American tennis star John Isner has been chosen as the best server of all time on the ATP Tour, according to renown tennis coach Patrick Mouratoglou.

The serve is arguably the most important shot in tennis, with momentum shifts during games depending on how well a player uses his serve. Mouratoglou, being one of the most well-known coaches in the tennis community, has vast experience and considerable knowledge on how to efficiently employ the serve as a weapon.

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Isner leads list of best serves on Mouratoglou's list

With Mouratoglou having coached the likes of WTA legend Serena Williams, former World No.1 Simona Halep and even rising Danish star Holger Rune, the Frenchman could be said to be an authority on analyzing weapons required to be successful on the court. That being said, the 53-year old released a list of his top 5 players ever on the ATP tour, with Isner taking the top position. Although this choice could be seen as a surprise to some, the towering American was known for having one of the most difficult serves to return on the ATP tour.

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Coming in second on the list was Australian Nick Kyrgios, who's serve could pose a threat to anyone when the former Wimbledon finalist was having a good day. Novak Djokovic' current coach, Goran Ivanisevic also made it to this select club of best servers. Below is Mouratoglou's complete list of top 5 servers in ATP history.

1. John Isner
2. Nick Kyrgios
3. Ivo Karlovic
4. Pete Sampras
5. Goran Ivanisevic