(AP Photo/Jim Young, file)

STOCKHOLM (AP) Third-seeded Stefanos Tsitsipas and No. 4 Jack Sock both needed three sets to reach the quarterfinals of the Stockholm Open on Wednesday.

Tsitsipas beat John Millman of Australia 6-4, 3-6, 6-3 in a little more than two hours, while Sock outlasted Swedish home favorite Elias Ymer 7-5, 3-6, 6-3 at the indoor hardcourt tournament. Chung Hyeon of South Korea also reached the quarters by beating American Denis Kudla 6-3, 6-3.

In first-round play, Denis Shapovalov beat fellow Canadian Peter Polansky 6-3, 5-7, 7-5.

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