Chasing 245 in the first one-day international of a three-match series on Tuesday, Masakadza laid the platform before Williams finished the job with an unbeaten 39 from 23 deliveries as Zimbabwe won by seven wickets with 10 balls to spare.
Although Misbah-ul-Haq held the Pakistan innings together in his, he was left to lament his decision to bat first at a venue where the pitch generally improves as the day goes on.
Mumbai Roundup: 9 incidents that took place this week
Photos: Ajay Devgn, Parineeti, Tabu at 'Golmaal Again' trailer launch
Photos: Dipika Pallikal Karthik oozes oomph in bikinis and sarees
Photos: Kareena Kapoor Khan's grand birthday bash
Photos: 'Dangal' girls Sanya Malhotra, Fatima Sana Shaikh's dinner outing