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Hamilton has the ability to hit the ball to fields with power, but of late, the only place he seems to drive the ball is to right.
In other words, he has had a major tendency to pull the ball.
Other teams have noticed too, which is why you are seeing more and more shifts employed against him.
As good as a hitter is Hamilton is, you would think he'd easily be able to beat the shift. All it requires is that he poke the ball the opposite way for an easy single.
However, in June at least, Hamilton has hit the ball directly into the shift on multiple occasions. He's not just hitting line drives into the shift, though; he's hit a lot of pop-ups and fly balls into right field.
When Hamilton was blazing early in the year, he was peppering the ball all over the ballpark. To break the slump he's in, he needs to get back to that.
Hitting the ball to the opposite field will help his swing, too. He'll have to shorten up his stroke and keep his hands back, which will help get his timing back too.
The best hitters in baseball work the baseball to all portions of the ballpark. For Hamilton to get back to that upper echelon, he will have to do the same.