The bout, scheduled for five rounds, will headline UFC 184 on pay-per-view.
Rousey, one of the UFC's top stars, weighed in at 135 pounds. She holds a 10-0 record and has finished each of her opponents. After an intense staredown, she promised to deliver an exciting victory on Saturday night.
Zingano, 9-0, came in at 134.5 pounds. When asked about Saturday's fight, she replied succinctly, "Watch this."