American Amanda Anisimova upset two-time reigning Australian Open champion Aryna Sabalenka 6-4, 6-2 on Saturday to reach the semi-finals of the WTA Toronto Masters.Anisimova, into her first Masters semi-final, advanced to a Sunday showdown against US eighth seed Emma Navarro, who eliminated fellow American lucky loser Taylor Townsend 6-3, 7-6 (7/5).