The U.S. won three of the six weight classes at the 2001 Manitoba Open Women's freestyle competition, Feb. 3.    Sara McMann (Lock Haven, Pa./Sunkist Kids), Toccara Montgomery (Cleveland, Ohio/Sunkist Kids) and Satrinina Vernon (Rodeo, Calif./Missouri Valley) all won their weight classes.     McMan won at 136.5 pounds. She decisioned Trish Leibel (NWO), 7-1.  This is her second win in one week. McMann also won the Missouri Valley International Open last week. She is currently ranked No. 1 at her weight classes in the U.S.    Montgomery decisioned Katie Downing (Pendleton, Ind./UM-Morris), 8-5. Montgomery is currently ranked No. 2 in the U.S. while Downing is ranked No. 5.    Vernon won at 165.25 pounds. Like McMann, this is her second win in one week. She also won the Missouri Valley International Open last week. Vernon is currently ranked No. 1 in the U.S.