'Great rhythm'published at 07:26 Greenwich Mean Time 21 January 2017
Zverev 6-4 3-6 6-6 (2-1) Nadal
Leon Smith
Great Britain Davis Cup captain on Radio 5 live sports extra
Zverev has such great rhythm in his serve and is serving this set at 75% in and, if you consider the speed of those serves, it is an impressive statistic.
He has a huge amount of confidence.