winning pitch; go-to pitch
Primarily used in baseball for a pitcher's best or decisive pitch, often thrown in a critical situation to get an out.
彼の決め球はフォークボールだ。
His go-to pitch is the forkball.
ピッチャーはここで決め球を投げてきた。
The pitcher threw his winning pitch here.
That pitcher throws his forkball as his go-to pitch.
He shut down the batter with his go-to slider.
His go-to pitch is a fast fastball.