The wicket of skipper Sindhu Sriharsha for 22 triggered a collapse as the rest of the batting unit fell apart. Tara Norris offered some resistance with a 23-ball 18 which included three boundaries but found no support from the lower order.
USA, who were 89/4 at one point, were skittled out for 131 with Loreen Tshuma the pick of the bowlers with figures of 10-2-19-3.
Modester Mupachikwa and Sharne Mayers got Zimbabwe off to blazing starting, stitching together 57 runs of the target in under 10 overs.
Despite losing both openers soon after, it looked like the hosts were cruising to victory before they collapsed in stunning fashion. Moksha Chaudhary ran riot with the ball, claiming four wickets in a span of four overs. From 73/2, Zimbabwe were seven down for 87.
At this stage, every small partnership was worth gold. Precious Marange and Loryn Phiri added 10 runs for the eighth wicket before Marange and Nomvelo Sibanda put on 18 runs for the ninth.
Once Marange got out, it was down to the No. 10 and 11 batters Nomvelo Sibanda and Francisca Chipare to get Zimbabwe across the line. At that point, they still needed 17 runs. Chipare found the ropes twice in the next over to release the pressure and finished the game off in style with a boundary as Zimbabwe got across the line by the barest of margins.
Wasim Qadri, Islamabad based Senior Journalist and Host Television show can follow on Twitter at @jaranwaliya