Andreescu was ahead 3-1. She became the first Canadian since Faye Urban in 1969 to win a tournament on home soil Sunday.
Her actions quickly drew praise, including from Williams, who called the teen an "old soul" and a "great sportswoman".
Andreescu withdrew in the second round at Roland Garros due to a shoulder injury and missed Wimbledon entirely due to injury.
She threw out the first pitch at a Jays game..
As for how Bianca handled this though, sportsmanship doesn't get much better than that. "She's got a lot of power, pace behind the ball".
Williams required a caesarean during the birth, which sidelined her for weeks in recovery. Bianca Andreescu has played and won against both of them. "I know everything about you", she says while lamenting her own injuries.
"This has definitely got my confidence level up there", Andreescu said of what her Toronto performance means to the rest of the summer hardcourt swing. Her back flared up while playing in the semifinals against Marie Bouskova.More news: Apple might update iPad Pros with three rear cameras
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"This isn't the way I expected to win or for (Serena) to go off the court, but you (Serena) are truly a champion on and off the court", said Andreescu after her win.
Andreescu finally saved on love to take a 6-5 lead when Kenin's return on her serve went wide. "She's a champion and she's an inspiration on and off the court". Andreescu claimed the title, but not before comforting the iconic athlete. "And hopefully that can show on the court for the rest of the hard-court swing this year", she said. She did the same thing when she won at Indian Wells. Her empathy and support for Serena were admirable.
For Canadian tennis star Bianca Andreescu, hearing idols praise her game and compassion has been nothing short of insane and overwhelming.
All of a sudden, she is the 14th highest ranked woman in the world, something that could wind up being a blessing or a curse.
She's taking a well-deserved break after her victory..
Like Andreescu, Auger-Aliassime has had a rapid ascent in 2019, surging from 109th to 21st in the ATP world rankings, heading into the tournament. On Aug. 11, she withdrew from the Western and Southern Open, but will appear again in the U.S. Open.
Williams is obviously one of the most accomplished players that the sport has ever seen.