A closing pitcher’s role is commonly recognized as the highest pressure position in professional sports. It takes equal parts physical skill and emotional fortitude to get this job done.
Even the most talented and experienced closer can’t dictate whether he’s going to have a successful outing; maybe there will be wind, rain or other distractions. What he can always control, though, is his behavior on the mound.
The same is true for all professionals: when you control your emotions, you control your game.