While the moment itself was heartbreaking to watch, it also included a touching exchange between Andreescu and Williams that saw Andreescu go over to comfort Williams and ultimately put a smile on her face before the two exchanged a comforting hug.
"And I've played many matches incredibly injured, you know, but this is just different", said Serena.
"I'm a pretty outgoing person and I'm not shy at all, and I knew what to say to her because I truly felt for her so much after what I've experienced with injuries in my short career. And, hopefully, this win can give me momentum into the U.S. Open".
Williams, who has leaped up the rankings to become the world no.10, had seen off Japan's Naomi Osaka 6-3 6-4 in her previous match, an eagerly anticipated semi-final showdown.
The 23-time women's singles Grand Slam champion was looking for her first title since making her comeback after giving birth o daughter Alexis Olympia and would have been the favorite had the back spasms not struck. You are truly a champion.
"I've been through so much the past two months, and all I can say is I'm so happy to be back on court", an emotional Andreescu said on-court. "This has been a dream come true".
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Kenin got a point back, but Andreescu's backhand victor sealed the match and brought the Canadian to her knees.
"I´m sorry I couldn´t do it today", Williams told the crowd, her voice cracking. "I tried, but I couldn't".
Before her historic Rogers Cup win, Narcity looked at a few facts about Andreescu that even her fans might not have known. "She definitely doesn't seem like a 19-year-old in her words, on court and her game, her attitude, or her actions". Sixteenth-seeded Gael Monfils then withdrew before his semifinal against world No. 1 Rafael Nadal.
Andreescu has mowed over seven top-10 opponents this season, including a pair of top-five players in Toronto, and has never lost to anyone ranked 10th or better. Her previous high was 22nd.
Andreescu is the first Canadian to make the Rogers Cup women's final in 50 years.
'This week has not been easy.
After a shoulder injury forced her to miss the French Open, Andreescu picked up where she left off in Toronto, beating world number five Kiki Bertens in the round of 16 and world number three Karolina Pliskova en route to the final.