When Eduardo Rodriguez came up in 2015, he relied heavily on his four-seam fastball, throwing it 69% of the time, the greatest frequency in major-league baseball among pitchers with at least 100 innings. He mixed in a slider and and change and was mostly successful, putting up league-average numbers at just 22 years old.
Last year, Rodriguez missed time at the beginning of the season due to a dislocated kneecap. He never really got on track after that, getting off to a bad start that included a demotion to the minors. He improved somewhat by the end of the season but never really put up great numbers. Clay Buchholz beat him out for the third spot in the playoff rotation, and Cleveland’s sweep of Boston meant there was no need for a fourth starter.
It would have been fair, not so long ago, to regard Rodriguez as the fifth starter — behind David Price, Chris Sale, Rick Porcello, and Drew Pomeranz — on the 2017 Red Sox. Two months into the season, though — with Price injured, Porcello failing to repeat last year’s success, and Pomeranz continuing to struggle since last year’s trade — Rodriguez has been the team’s clear No. 2 option after the excellent Chris Sale. His 3.10 ERA is quite strong; his 3.34 FIP, 20% better than league average and bordering on ace level. It’s early, but Rodriguez has made a few different changes that have helped him become a more successful pitcher
We could simply write off last season as one plagued by injury and not bother to examine it any more thoroughly than that, but there’s some solid data in there. One thing to keep in mind — and something we should do for all pitchers, especially younger ones — is that it generally takes time to figure things out at the major-league level. Pitchers can be tinkering with different pitches, different pitch mixes, in order to get things right. A pitcher might not be pitching well at times, but he also might be taking the next step to becoming a better pitcher. Some of this should be taken with a grain of salt, but here is Rodriguez’s pitch mix over the last three seasons.
Eduardo Rodriguez Pitch Mix
Season |
FA% |
FT% |
FC% |
SL% |
CH% |
2015 |
69.2 % |
1.4 % |
|
11.6 % |
17.9 % |
2016 |
49.8 % |
17.5 % |
|
16.1 % |
16.7 % |
2017 |
58.0 % |
10.0 % |
3.4 % |
8.7 % |
19.9 % |
SOURCE: PITCHf/x
As noted above, Rodriguez threw his fastball a ton when he first arrived in the majors, mixing in his slider and change. Last season, he introduced a two-seam fastball and upped his slider usage. The slider was a pitch on which he worked in the minors and used it a lot when he came back up, but ultimately didn’t have a lot of success with it. Rodrgiuez’s best pitches in the majors have been the fastball and change. This season, he has gotten back to using those pitches the most. He throws both pitches for strikes, induces swings close to 50% of the time, and generates above-average whiff rates for each pitch (11% for the fastball and 22% for the change, per Brooks Baseball). Throwing those pitches more has yet to lessen their effectiveness. While increased use of his four-seam fastball is notable, as is continued use of the change, the decrease in the use of the slider is a big difference.
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