Hello and welcome to live updates of the second match of the 2017 Nitto ATP World Tour finals. It's rising star and world No.3, Alexander Zverev against 2014 US Open champion, Marin Cilic in Boris Becker group.

HEAD-TO-HEAD: Zverev leads the match-up 3-1. In their most recent encounter earlier this year in Madrid, the German starlet came from a set down to make the last 16 with a 6-7 6-3 6-4 triumph. Cilic's only victory came in their first ever showdown in Washington back in 2015.

Earlier today, Roger Federer got his bid for a seventh end of season crown with a 6-4 7-6 victory over Jack Sock in the first match in Boris Becker group.