The 23-time grand slam champion put in a dominant performance against the Romanian, winning 6-3 6-3, on Tuesday at Rod Laver Arena.
It will be the 40th grand slam semifinal of Williams career as the 39-year-old looks to equal Margaret Court’s record of 24 career grand slam victories.
The American will now face three-time grand slam winner Naomi Osaka in the semifinal after the 23-year-old breezed past Hsieh Su-wei in just 66 minutes — 6-2 6-2 — in their quarterfinals.
The semifinal between Williams and Osaka will be the pair’s first meeting since the final of the 2018 US Open when Williams clashed with umpire Carlos Ramos.
More to follow.