NEW YORK — Croatian teen Ana Konjuh avenged a Wimbledon loss with an upset victory over Agnieszka Radwanska on Monday to claim the last women’s quarterfinal spot at the US Open, while Serena Williams reached a fresh milestone as she sailed through.Williams’s 308th Grand Slam win — a 6-2 6-3 victory over 52nd-ranked Yaroslava Shvedova — took her past Roger Federer for the most in major tournaments."Wow, it’s really exciting," Williams said. "This is where it all started so it’s always so magical out here for me — 308 sounds pretty good."Konjuh stunned fourth-seed Radwanska 6-4 6-4.READ THIS: Serena reaches 307 Grand Slam winsWith Radwanska out of the picture, second-seeded German Angelique Kerber is now the only player with a chance to end Williams’s 186-week reign atop the rankings.Kerber will try to take the next step on Tuesday in a quarterfinal clash with 2015 finalist Roberta Vinci, the seventh seed from Italy.Former world No 1 Caroline Wozniacki and Latvian Anastasija Sevastov...

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