After his 2017 call-up, Red Sox third baseman Rafael Devers posted an OPS+ of 112 in 240 plate appearances.
After his 2012 call-up, Red Sox third baseman Will Middlebrooks posted an OPS+ of 121 in 284 plate appearances.
Devers does not present the red flags that Middlebrooks showed, but we should temper our expectations.
Pulling a number out of the air without a sophisticated statistical analysis, I am 98 percent confident that Devers will have a better MLB career than Middlebrooks has. Although I expressed reservations about Middlebrooks after his rookie season, no one could have predicted how his career has played out to date.
Devers was three years younger than Middlebrooks was at the time of their MLB debuts, but here are their rookie lines:
RD 58 G, 240 PA, .284/.338/.482/.819, OPS+ 112, 34 R, 10 HR, 30 RBI, 3 SB
WM 75 G, 288 PA, .288/.325/.509/.835, OPS+ 121, 34 R., 15 HR, 54 RBI, 4 SB
RD BB% 7.9, K%, 23.8, ISO .198, BABIP .342, wRC+ 111, 0.9 fWAR, 1.3 bWAR
WM BB% 4.5, K% 24.5, ISO .221, BABIP .335, wRC+ 122, 1.9 fWAR, 1.3 bWAR
At third base:
RD 507.2 innings, -1 defensive runs saved, -12.7 UZR/150
WM 606.2 innings, -3 defensive runs saved, 2.4 UZR/150