rafael nadal roland garrosRafael Nadal of Spain celebrates victory at the French Open on June 11, 2017 while wearing his Richard Mille RM27-02.Julian Finney/Getty Images

Expensive Swiss mechanical watches don’t have much practical use on the field, court, or track, though it’s not uncommon to see the world’s biggest athletes wearing high-end, luxury timepieces during their events.

Nevertheless, watch brands are eager to sponsor elite athletes, from fighters like Floyd Mayweather to tennis champions like Roger Federer and Rafael Nadal, not for their horological expertise but for their aura — which sells.

We got a helping hand from the experts at Crown & Caliber to determine the make and models of 20 timepieces worn by the world’s top athletes.

Scroll down to see them ranked in ascending order of price: