Serena Williams and Japan’s Naomi Osaka booked a rematch of last year’s US Open final in the WTA Toronto quarter-finals after straight-set triumphs Thursday. Reigning US and Australian Open champion Osaka broke at love in the final game to defeat Polish teen Iga Swiatek 7-6 (7/4), 6-4 after one hour and 51 minutes. World number 10 Serena Williams was broken twice and dropped the first three games in 10 minutes then battled back to defeat Russia’s 48th-ranked Ekaterina Alexandrova 7-5, 6-4 in 91 minutes.

That set the stage for Serena Williams, a 37-year-old American who will try for a record-tying 24th Grand Slam singles title at the upcoming US Open, to again face Osaka after the controversial finish to their Grand Slam showdown last year in New York.

It would be the first match between Osaka and Serena Williams since the Japanese star defeated her childhood idol 6-2, 6-4 in last year’s US Open final, a match marred by an on-court dispute between Serena Williams and the umpire that led to a game penalty against the American.

Williams spoke after her match but before that she knew who she would face in the quarter-finals, saying either Osaka — who could return to the world number one ranking next week — or Swiatek would be worthy foes.

Alexandrova broke Williams – in the 2001, 2011 and 2013 Canadian champion — in the first and third games for a 3-0 edge only to have Williams roll through the next four games.

They held from there until the final game of the first set, when the Russian’s eighth double fault handed Williams the set after 46 minutes.

Czech third seed Karolina Pliskova kept the pressure on Osaka in the battle to take the world number one ranking by also reaching the quarter-finals.

Pliskova eliminated Estonia’s Anett Kontaveit 6-3, 7-5 to set up a last-eight clash with rising Canadian star Bianca Andreescu, who outlasted fifth-seeded Dutchwoman Kiki Bertens 6-1, 6-7 (7/9), 6-4.
In French Open champion Ashleigh Barty’s stint as the world’s top-ranked player was assured of ending after she was knocked out on Tuesday.

Defending champion and fourth seed Simona Halep of Romania, coming off a Wimbledon title last month, beat Russia’s Svetlana Kuznetsova 6-2, 6-1 to book a quarter-final against Czech qualifier Marie Bouzkova, who ousted Latvia’s Jelena Ostapenko 6-2, 6-2.