Rafael Nadal’s Richard Mille RM 27-01 Richard Mille broke its own record for lightest watch when they released the Richard Mille RM 27-01 “Rafael Nadal” in 2013. The watch weighed just 18.83 grams, including the strap (which, by the way, is the heaviest part of this watch).

2010 would be the first time Rafael Nadal wore a watch, let alone a Richard Mille, during a tennis match. Nadal worked with Richard Mille to test the watch out in real world conditions to make sure it was light enough to play in. At the time, the RM 027 weighed less than 20 grams (including the strap) and was the the lightest watch ever produced.

Subtlety has never been within Richard Mille’s wheelhouse; accordingly, many of the Nadal watches play into the brand’s bold and expressive philosophy. Before the new RM 27-04, the RM 27-03 was tiger striped with the red and yellow of the Spanish flag as an homage to Nadal’s home country.

This week, the two combined as Rafael Nadal took to the court at Roland Garros for the French Open in a brand spanking new Richard Mille piece. The watch commemorates the duo’s 10-year partnership, and is the fifth between them.