Carlos Zambrano’s Declining Fastball

June 5, 2010 by  

Over the past several years Carlos Zambrano has been the keystone to the Cubs starting rotation, leading the group as the ace since the days of Mark Prior and Kerry Wood.

The fact of the matter is that Zambrano hasn't posted an ERA under 3.50 since 2007, and for a "power pitcher," he has only exceeded 200 strikeouts twice in his seven year tenure as a starting pitcher.

Zambrano has always dazzled fans with both his electric fastball and temper, but the fastball that reached the mid-90s and posted positive win values each year of his career is showing signs of decline.

Zambrano's fastball is averaging 90.9 mph, down from his career average of 92.1. He is also throwing it 52.4 percent of the time, far down from ...

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