Nick Kyrgios has experienced plenty of success as a tennis player, but away from the court, he has made his love for the popular video game Fortnite well-known.

“You should first find the most comfortable and controllable racquet for your game,” says Dave Bone, executive director of the U.S. Racquet Stringers Association and a TENNIS technical adviser.

From an historical perspective, the evidence is mixed. Like any group of professionals, the world’s best tennis players are fussy about the tools of their trade. They’re creatures of extreme ...