Serbian Novak Djokovic has dominated the court since turning pro in 2003; he’s been ranked the top men’s pro tennis player for a record 428 weeks in his career, won 24 Grand Slam titles, and is considered by many to be one of the greatest men’s tennis players of all time.

Djokovic also follows a gluten-free diet after a doctor diagnosed him with an allergy. After going gluten-free for a fortnight, the Djoker saw an uptick in his athletic performance and never looked back.