School Spirit

Andrea Petkovic grabbed the initiative to subdue Venus Williams, 6-1, 3-6, 7-5, in the Stanford quarterfinals, writes Steve Tignor.

Comfort Zone

Milos Raonic won his fifth tiebreaker of the week, rolling into the Washington semifinals with a 7-6 (2), 6-2 win over Steve Johnson.

XL Enigma

Five years after Juan Martin del Potro won the U.S. Open he remains a talented—and brittle—enigma, writes Peter Bodo.

First Ball In: Anything Is Pospisil

Vasek Pospisil and Venus Williams impressed beating seeds on Thursday. Steve Tignor recaps their wins and previews Friday's quarterfinals.

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