From qualifying to the semifinals: Ana Konjuh continued her San Jose run with a 3-6, 6-2, 6-0 victory over Zhang Shuai.
Fifth seed Jannik Sinner dismissed Steve Johnson, 6-2, 6-4, to set a semifinal showdown with the red-hot Jenson Brooksby in Washington, D.C.
Kei Nishikori remained on course for a second career Citi Open crown when he eliminated the man who ousted Rafael Nadal in the previous round, Lloyd Harris, 6-3, 7-5.
Pushed to three sets once again, fourth seed Daria Kasatkina found her way past Magda Linette, 6-4, 3-6, 6-4, in the quarterfinals of the Mubadala Silicon Valley Classic.
In an all-American tussle at the Citi Open, Mackenzie McDonald emerged victorious, 6-3, 6-2, against Denis Kudla to secure his second tour-level semifinal berth (2019 Delray Beach).