Carlos Alcaraz suffered a defeat in his opening match at the ATP tennis finals.

The Wimbledon champion lost to world number seven Casper Ruud.

In the same group, Alexander Zverev eased to a two sets victory over Andrey Rublev.

World number one Jannick Sinner faces Taylor Fritz in a repeat of the US Open final, tonight.

This afternoon’s match sees Danil Medvedev face Alex De Minaur.