Norm Hall/Getty Images
Even Zack Greinke is perplexed by what happened last season.
The numbers obviously speak for themselves. The former Cy Young winner went from a league-best 1.66 ERA in 2015, his final season with the Los Angeles Dodgers, to a 4.37 ERA in 2016, his first season with the Arizona Diamondbacks.
The latter of those numbers isn't ace material. That's not a great look under any circumstances. It's a worse look when said ace is under contract for $206.5 million.
As for what went wrong, Greinke could have made it easy on himself and pinned it all on the oblique and shoulder issues he ran into at the end of the year.