YOKOHAMA, Japan—The United States had just given up its first run and was two outs away from losing for the first time in the Olympic softball tournament. Amanda Chidester stepped up to the plate with two runners on and slapped the ball into left field. “In my head, I’m like, ‘Score! Score two! Score two! Score two!’” she recalled. “When I got up and everyone was running out at me, I was like, ‘We did it!’” Pinch-runner Ally Carda and Haylie McCleney came across the plate on Chidester’s eighth-inning single, giving the United States a pulsating 2–1 victory over Australia on Sunday and a rematch with defending champion Japan in Tuesday’s gold medal game. Monica Abbott (2–0) struck out 13 and threw a three-hitter in a 126-pitch complete game, giving up an unearned run when Jade Wall walked on eight pitches with the bases loaded in the top of the …