WTA Tour, Bell Challenge: Ajla Tomljanovic breaks news ground in Quebec City
Ajla Tomljanovic reached her first WTA Tour quarter-final in Quebec City.
Last Updated: 16/09/13 6:33am
The pair had been doing battle for more than two hours when, with Tomljanovic leading 7-5 3-6 4-1, fourth-seeded American Mattek-Sands fell and could not continue.
"She slipped and her knee is in bad shape," the 20-year-old Croatian told the WTA Tour's official website. "Winning this match is bittersweet. I feel really bad for her.
"She hasn't had an easy road. I hope she recovers as soon as she can."
Tomljanovic will face Marina Erakovic, the eighth seed from New Zealand, in the last eight.
Second seed Kristina Mladenovic of France was also the beneficiary of a retirement. She led Petra Martic 6-3 2-3 when the Croatian halted proceedings due to illness.
Mladenovic will face Eugenie Bouchard in the quarter-finals after the Canadian fifth seed despatched Kazakh qualifier Sesil Karatantcheva 7-6 (7/2) 6-4.
Third seed Lucie Safarova of Czech Republic sent down 13 aces and saved five set points in the second-set tie-break en route to a 7-6 (7/4) 7-6 (12/10) victory over Croatia's Mirjana Lucic-Baroni.
Next up for Safarova is a meeting with seventh-seeded American Lauren Davis, who edged a topsy-turvy encounter with Czech Andrea Hlavackova 6-1 2-6 6-3.