1. Rolex Sky-Dweller
The Rolex Sky-Dweller is one of the brand's most complicated watches and combines a dual-time zone function as well as an annual calendar. All of the functions are controlled by using the crown and the bezel, a feature first introduced in the Rolex Yacht-Master II (which has also been seen on Federer's wrist).
The Sky-Dweller that Federer is seen wearing above is the latest version, released at Baselworld 2017, in steel and white gold with a beautiful blue dial.