(AP Photo/Elise Amendola)

NUR-SULTAN, Kazakhstan (AP) Defending champion John Millman was upset by fellow Australian James Duckworth in the quarterfinals of the Astana Open on Friday, as Alexander Bublik also reached the semifinals.

Duckworth beat fifth-seeded Millman 6-4, 6-4 to reach the semifinals of a tour event for the second time in his career and first since the Maharashtra Open in February 2020.

In a match between friends who train at the same site, Duckworth broke Millman in the opening game of each set. Millman saved match point at 5-3 down in the second but Duckworth closed it out in the next game.

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