Zheng hit American 15th seed Madison Keys to declare her first win complete a top-20 subordinate since having elbow room successful July.
Sabelenka has won 7 of her 8 meetings pinch Olympic champion Zheng.
Third seed Elena Rybakina cruised into nan past 16 pinch a 6-3 6-4 triumph complete Ukraine's Marta Kostyuk.
Kazakhstan's Rybakina will play Australian qualifier Talia Gibson, who knocked retired different seeded subordinate courtesy of a 6-2 6-2 triumph complete 18th seed Iva Jovic.
Gibson, who reached nan Indian Wells quarter-finals, hit erstwhile world number 1 Naomi Osaka successful nan 2nd information successful Miami.
Fifth-seeded American Jessica Pegula, runner-up to Sabalenka past year, needed only an hr and six minutes to hit Canada's Leylah Fernandez 6-2 6-2.
Latvia's Jelena Ostapenko, runner-up successful Miami successful 2018, fought backmost to declare a 5-7 6-2 7-5 triumph complete seventh seed Jasmine Paolini of Italy.
Ostapenko will adjacent play American world number 45 Hailey Baptiste, who hit Ukrainian ninth seed Elina Svitolina 6-3 7-5.
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