Fangraphs: Building Jake Arrieta

[Can_of_corn]

I was glad to see him go and don't think he would have replicated his performance this year if he had stayed.

Let?s go back to 1920. Let's look at starting pitchers who threw at least 75 innings in consecutive big-league seasons. Relative to last year, Jake Arrieta's K-BB% has improved by 14 percentage points. That's the fourth-greatest improvement within the sample. Relative to last year, Arrieta's FIP- has improved by 64 points. That's the single greatest improvement within the sample, edging out 2007-2008 Cliff Lee. This is what a breakout looks like. This is what maybe the biggest breakout looks like.

With Chris Bosio and the Cubs, Arrieta's worked on his throwing motion. He's forever been working on his throwing motion - that never really stops - but with the Cubs, instruction has clicked.

[Il BuonO]

I was glad to see him go and don't think he would have replicated his performance this year if he had stayed.

It might not have. As in the piece you posted, something clicked for him with Bosio and the Cubs. It may have been a combination of factors.

No one could say Jake wasn't a hard worker and as the article also points out he was constantly trying something. It may have taken him getting out of Baltimore to realize his potential.