Day 9: Djokovic and Serena semifinals-bound, Aslan roars into last four

Novak Djokovic fends off Alex Zverev to reach the semifinals for a ninth time, Serena Williams produces her best match of the tournament against Simona Halep, Naomi Osaka overpowers Hsieh Su-Wei, and Aslan Karatsev becomes the first qualifier in 43 years to reach the last four of a major, on a historic Day 9 of the Australian Open.

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