Nineteen-year-old Bianca Andreescu will face Williams in the final of the Rogers Cup.
The unseeded home favourite beat American Sofia Kenin in two sets, 6-4 7-6.
She's spent much of the past year out with a shoulder injury but gained attention with her Indian Wells triumph in March.
Zimbabwe stun Australia to stay unbeaten in T20 World Cup
Australia were dealt an early blow in their quest to reach the Super Eight stage of the Twenty20 World Cup after the depleted former champions crashed to a 23-run defeat by Zimbabwe in Colombo on Friday.
Arsenal miss chance to go six points clear with draw at Brentford
Arsenal has wasted the chance to restore their six-point lead at the top of the Premier League table as they were held to a 1-1 draw at Brentford on Thursday, with Noni Madueke's second-half header cancelled out by Keane Lewis-Potter.
India thump Namibia ahead of Pakistan clash
Defending champions India continued their march towards the Super Eight stage of the Twenty20 World Cup with a 93-run win over Namibia in a group A contest at Arun Jaitley Stadium on Thursday.
Italy crush Nepal in maiden T20 World Cup victory
Brothers Justin and Anthony Mosca guided Twenty20 World Cup debutants Italy to their first win in the tournament, as their unbeaten half-centuries secured a dominant 10-wicket victory over Nepal in a Group C clash on Thursday.
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