Magill with
John Isner
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John Isner With Magill

At a towering height of 6’10” and wingspan that seems to stretch the entire width of a tennis court, it’s hard to miss John Isner. But it’s his English Cocker Spaniel, Magill, that steals the spotlight on the court and he isn’t afraid to face his dad’s 150mph serve!

With access to an unlimited supply of tennis balls, Magill (named after the Georgia Bulldog Coaching Legend, Dan Magill) is living the dream and thinks he has the best dad that a dog could hope for.

Highly touted as having the most powerful serve on the ATP World Tour, John turned pro in 2007 and achieved his career-high singles ranking of world No. 9 in 2012. At the 2010 Wimbledon Championships, he played the longest professional tennis match in history, defeating Nicolas Mahut after 11 hours and 5 minutes over the course of three days! Yes… an 11-hour tennis match! Then, in 2018 John had to test his endurance once again when he battled South African Kevin Anderson for 6 hours and 35 minutes in the longest semi-finals match in Wimbledon history.

John credits his elite nutrition for allowing him to focus on a ball for hours on end and knows that Magill needs the same level of superior nutrition to stay energized throughout each day and fetching balls for years to come.

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Aces For Animals

John and Magill embody Nulo’s mission – the passion to inspire others to live active, healthy lives – and provide pets the same opportunity. According to John, "THE TENNIS COMMUNITY CARES ABOUT FITNESS AND NUTRITION AND THIS IS OUR CHANCE TO INSPIRE OTHERS TO CARE ABOUT THEIR PET’S NUTRITION WHILE WE HELP DOGS AND CATS FIND THEIR FOREVER HOME.” That’s why John has teamed up with Nulo for an exclusive Aces for Animals Foundation. Nulo donates 10 meals of pet food to a local animal shelter for every ace that John serves at select ATP World Tour events. We're looking forward to a new season and an even bigger contribution next year. He is currently at over 10,400 aces - making him 3rd in aces history... So keep on serving up those aces John, as we are looking forward to donating even more meals to shelter pets in need next year.

2018 // 404 aces = 4,040 Meals

  • New York Open: 28 aces and 280 meals
  • Delray Beach Open: 51 aces and 510 meals
  • PNB Paribas Open: 15 aces and 150 meals
  • Miami Open: 40 aces and 400 meals
  • Fayez Sarofim & Co. U.S. Men’s Clay Court Championship: 40 aces and 400 meals
  • BB&T Atlanta Open: 83 aces and 830 meals
  • Citi Open: 9 aces and 90 meals
  • Western & Southern Open: 38 aces and 380 meals
  • U.S. Open: 100 aces and 1000 meals

2017 // 373 aces = 3,730 Meals

Check back to see how he's progressing as he swings through his ATP tournaments! You can also follow us for the latest on #AcesForAnimals on Instagram and Facebook.



  • Career Record: 408-249
  • Career Titles: 14
  • Highest ranking: No. 8 (July 2018)
  • Current ranking: No. 10 (April 2019)


  • Australian Open 4R (2010, 2016)
  • French Open 4R (2014, 2016, 2018)
  • Wimbledon 3R (2014, 2015) SF (2018)
  • US Open Quarter Finals (2011, 2018)


  • QF (2012)


  • The longest match in history at 11 hours and 5 minutes
  • 113 aces in an ATP singles match
  • 113 aces in a Grand Slam singles match
  • 85 aces in a single set
  • 92 games won in a single match
  • 91 games lost in a single match that he won
  • 246 winners in a single match
  • Longest Grand Slam semifinal ever played at 6 hours and 36 minutes
  • Second-most aces in the history of the ATP World Tour
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John's Picks
John serves a high-omega diet of FreeStyle Limited+ Salmon and Turkey, Salmon & Chickpeas wet food to keep Magill limber and ready to fetch.
Nulo Food Finder
Score Summary
Pet Type
Commodity Grain Free

Woof! Yep, we thought you were a dog person.

Now let's get an understanding of what you're currently feeding your dog. Go grab your current dog food bag!

12% Completed
Nulo Food Finder
Score Summary
Pet Type
Commodity Grain Free

MeWow! We thought you were a cat person.

Now let's get an understanding of what you're currently feeding ... go grab your cat food bag!

12% Completed