Alexander sealed the deal in two hours and 42 minutes, overcoming a set deficit and outplaying his rival with a strong performance in sets two and three. Thus, the German secured his 21st Masters 100 semi-final, leaving Andy Roddick on 20.

Alexander Zverev rallied from a set down to beat defending champion Alexei Popyrin 6-7(8) 6-4 6-3 in Toronto and move into the semi-finals of the Canadian Open on Monday.