The Wall Street Journal calculated how many calories John Isner and Nicolas Mahut burned off during their marathon Wimbledon tennis match earlier this week, which spanned three days.
The official weights for the American Isner and French Mahut are 245 pounds and 176 pounds, respectively. According to FitDay’s activity calculator, the 6-foot-9, 25-year-old Isner burns 717 calories per hour of singles tennis, while 6-3, 28-year-old Mahut burns 563 calories per hour.
The numbers are rough estimates since FitDay’s version of singles tennis is not Wimbledon-level, but by that math, Isner burned off about 7,960 calories and Mahut “torched” about 6,250.
So Isner’s game-day(s) burn was the equivalent of about 15 Big Macs to 12 for Mahut.