A few weeks ago, I was listening to an interview with Jake Arrieta on MLB Radio. Jake had always had good stuff, but wildness and other issues caused him to put up these insane ERA’s:
- 2010 – 4.66
- 2011 – 5.05
- 2012 – 6.20
- 2013 – 7.23
Midway through the 2013 season he was traded to the Chicago Cubs, with these ERA results:
- 2013 – 3.66
- 2014 – 2.53
- 2015 – 1.88
That is a startling difference.