A starting pitcher can take control of a game and singlehandedly lead his team to a win, but in general, it's hard for baseball players to will their team to victory day after day.
Starters pitch once every five days and position players know that even on a five-hit night, you're dependent on your own pitchers standing tall, and every time you reach base, you have to wait a couple innings for another chance to impact the game.
But every once in a while, a hitter gets so hot that it seems he's carrying his team for weeks at a time.