left-center field
Baseball term for the area between the left fielder and center fielder.
The hit ball went deep into left-center field.
He hit a big shot to left-center field.
右中間 is the gap between the right fielder and center fielder, while 左中間 is the corresponding gap on the left field side.
Compound of 左 (left), 中 (center), and 間 (space, between), referring to the gap between left and center fielders in baseball.