The Association of Tennis Professionals, which operates the men's ATP World Tour, has extended its partnership with Swiss watchmaker Rolex.
The renewed deal will run through to the end of the 2020 season.
Rolex will continue in its role as the official timekeeper of both the ATP World Tour and the season-ending ATP Finals.
Rolex has supported the ATP Finals since the 2005 season and in 2013 opted to expand its relationship with the ATP by also becoming an official partner of the ATP World Tour.
The 2017 ATP Finals at The O2 in London, England, began on November 12 and will run until November 19.