Roger Federer hailed Alexander Zverev as the complete package after beating the German up-and-comer to book his place in the last four of the ATP Finals. The Zverev, 20, showed London's O2 Arena why he will surely become a star of men's tennis one day but Federer's own time is far from finished yet and his class eventually told. Sixteen years and 19 grand slam titles separate this pair but remarkably it was Federer's legs that were fresher in the decider, and after two hours and 11 minutes he had won 7-6 (8/6), 5-7, 6-1.

Germany's Alexander Zverev celebrates after winning a point against Switzerland’s Roger Federer during their ATP World Tour Finals match  in London yesterday. Federer won 7-6 (8-6), 5-7, 6-1. Pic/AFP