Zack Greinke is one of the best pitchers in major league baseball, and as a result, he had no shortage of suitors before ultimately signing a contract in excess of $200 million. In addition to money, the Diamondbacks also surrendered their first-round pick next year, the 13th overall selection. While it would not be quite true to say that Greinke cost “only money,” the Diamondbacks did not give up a single active player in order to acquire Greinke.
Cole Hamels, both the same age as Greinke and roughly as effective over the course of his career, was traded over the summer. Hamels’ cost was not “only money,” as the Texas Rangers gave up six players, including three high-end prospects (and Matt Harrison’s contract), for Jake Diekman and the opportunity to pay Cole Hamels around $100 million over the next four years. While the costs come in different forms, we can compare the two to see how the trade market this past summer compared to this offseason’s free agent market for Greinke.
The Los Angeles Dodgers prioritized Cole Hamels at the trade deadline, but subsequently missed out by refusing to part with their best prospects. The team then prioritized bringing Greinke back, only to be outbid by division rival Arizona. The cost for both players was high, and it is difficult to say whether the Dodgers made a mistake passing on both players, but we should be able to compare the costs for both to see if the Dodgers could have kept a comparable pitcher for less than the amount Greinke received in free agency.
As far as comparisons go, Greinke did have a better year in 2015, but their cumulative WAR graphs (shown below) reveal two remarkably similar careers in terms of value.

In addition, both players are projected to do well next season. By Steamer, Greinke is set for a 4.2 WAR while Hamels comes in a bit behind at 3.6 WAR for the 2016 season. Using those projections as the baseline for future production, we can get an estimate for their value over the next few years. With deferrals, Greinke’s deal turns out to be $194.5 million over six seasons, per Ken Rosenthal. Given the consistency of both Greinke and Hamels, for the purposes of this analysis, we will assume the players will age well.
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