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.

Top-seeded Alexander Zverev rallied to defeat No. 18 Alexei Popyrin of Australia 6-7 (8), 6-4, 6-3 on Monday to reach the semifinals of the National Bank Open.

Top seed Alexander Zverev ended Alexei Popyrin's title defence at the Canadian Open with a 6-7(8), 6-4, 6-3 victory and sailed