The unseeded American upset No. 4 Barbora Krejcikova, 6-3, 6-2, to advance to the semifinals at the Grand Slam tournament for the first time since 2015.
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Madison Keys Defeats Barbora Krejcikova at Australian Open
The unseeded American upset No. 4 Barbora Krejcikova, 6-3, 6-2, to advance to the semifinals at the Grand Slam tournament for the first time since 2015.