It also frustrated many Philadelphia players, both offensively and defensively. Among them, A's and Phillies outfielder Elmer Valo and Phillies right fielder Johnny Callison, both lefthanded batters, complained that the high right-field fence cost them many home runs. It dogged them when they played the field, too: its rippling corrugations made caroms unpredictable, with some balls dropping straight down, others bounding all the way back to second base and some bouncing radically to one side or another, sometimes into the bullpen. It was "one of the hardest" walls to play in the majors.