And now for the moment you’ve all been waiting for, the Positional Power Rankings of starting rotations
before they actually get good.

It should be noted that the Diamondbacks’ rotation at 16 really projects no differently than the Rays’ rotation at 15, which Jeff will be writing up in his More Important post on the 15 best starting rotations. Which, in fact, serves as a useful reminder that, when dealing with the 7-10 moving parts of which these rotation depth charts typically consist, the actual ranking of teams matters far less than the grouping of teams. We can be pretty certain that the No. 16-ranked Diamondbacks rotation, projected for about +13 WAR, is better than the No. 30-ranked Braves rotation, projected for just +7 WAR. It gets a little cloudier in the middle, though, and just because the A’s (+11.3 WAR) are three spots ahead of the Tigers (+11.0 WAR), that shouldn’t be taken as any kind of definitive statements of Oakland’s superiority. A guide, is how these rankings should be used.
#16 Diamondbacks
| Name |
IP |
K/9 |
BB/9 |
HR/9 |
BABIP |
LOB% |
ERA |
FIP |
WAR |
| Zack Greinke |
212.0 |
8.3 |
1.9 |
0.8 |
.294 |
76.8 % |
2.91 |
3.20 |
4.6 |
| Shelby Miller |
183.0 |
7.5 |
3.1 |
1.0 |
.296 |
73.7 % |
3.84 |
4.08 |
1.9 |
| Patrick Corbin |
160.0 |
7.6 |
2.3 |
0.9 |
.303 |
73.0 % |
3.58 |
3.65 |
2.5 |
| Rubby de la Rosa |
141.0 |
7.3 |
3.0 |
1.1 |
.302 |
71.2 % |
4.24 |
4.26 |
1.2 |
| Robbie Ray |
129.0 |
8.6 |
3.7 |
0.9 |
.306 |
72.8 % |
3.86 |
3.89 |
1.7 |
| Archie Bradley |
85.0 |
7.5 |
4.5 |
1.0 |
.303 |
70.3 % |
4.54 |
4.56 |
0.4 |
| Zachary Godley |
28.0 |
7.3 |
3.5 |
1.0 |
.301 |
70.8 % |
4.27 |
4.31 |
0.2 |
| Tyler Wagner |
19.0 |
6.2 |
3.4 |
1.2 |
.301 |
70.1 % |
4.67 |
4.75 |
0.1 |
| Josh Collmenter |
9.0 |
6.0 |
2.1 |
1.2 |
.292 |
73.3 % |
3.94 |
4.28 |
0.1 |
| Total |
965.0 |
7.8 |
2.9 |
1.0 |
.300 |
73.2 % |
3.75 |
3.88 |
12.7 |
So, the team that lost Zack Greinke this offseason is tied for first among projected starting rotations. The team that gained Zack Greinke is hanging around the middle of the pack. This tells us a couple useful bits of information, the first being that that Clayton Kershaw fella is quite good. Kershaw alone accounts for the same projected WAR total as Miller, Corbin, de la Rosa, Ray and Bradley combined, and the Dodgers still have other pitchers, too. As for the Diamondbacks‘ position on this power ranking, it gives us an idea as to why, even with Greinke, many are still skeptical of the organization’s position as a legitimate contender in a competitive National League.
One caveat, in the Diamondbacks’ favor: they have one of the largest differences between their projected ERA and FIP. The sixth-largest, in fact. That is to say, if these rankings were sorted in order of RA9-WAR, rather than FIP-WAR, the Diamondbacks would stand to gain more from it than most every other team. Greinke was worth 10 RA9-WAR last year, and would see his projection increase by a full win if we went with the runs-allowed model. Shelby Miller also has the early signs of being a FIP-beater, and his projection would increase by nearly a win with the RA9 model.
So maybe the top half is a bit underrated, but the bigger issue lies within the bottom half. Rubby de la Rosa is now entering year three of “maybe that 95-mph fastball will miss some bats soon!” and this could be his last chance. Nearly all of Archie Bradley’s prospect sheen has worn off, and at this point the Diamondbacks might be happy if he winds up being a serviceable fourth or fifth starter. Zack Godley had a shiny ERA last year, but still has major command issues and was a 25-year-old who started last year in High-A for a reason. The top three can go pitch for pitch with most trios in baseball — Patrick Corbin looked every bit the budding-ace of 2013 after returning from Tommy John — but if any of them suffer prolonged injury, or de la Rosa pitches his way out of the rotation, Arizona could be handing out less-than-ideal starts in the midst of their playoff hunt.
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