Six rookies got the call and made their major league debuts this week. This will mostly be a run-down of their basic PITCHf/x numbers, but I have a few observations - despite the small samples.
| rookie | pitch | # | vs LHH | vs RHH | MPH | PFX_X | PFX_Z | DEG | RPM |
| Cesar Carrillo | Change | 11 | 6 | 5 | 86.2 | -7 | 2 | 253 | 1429 |
| Cesar Carrillo | Curve | 17 | 7 | 10 | 80.5 | 7 | -4 | 58 | 1419 |
| Cesar Carrillo | Sinker | 8 | 8 | 0 | 93.9 | -8 | 5 | 237 | 1916 |
| Cesar Carrillo | Fastball | 26 | 11 | 15 | 94.5 | -6 | 8 | 215 | 2063 |
| Esmailin Caridad | Change | 1 | 1 | 0 | 81.3 | -7 | 2 | 252 | 1278 |
| Esmailin Caridad | Sinker | 24 | 8 | 16 | 92.8 | -6 | 5 | 231 | 1591 |
| Esmailin Caridad | Fastball | 45 | 26 | 19 | 94.4 | -4 | 8 | 207 | 1799 |
| Esmailin Caridad | Slider | 22 | 3 | 19 | 77.6 | 7 | -2 | 76 | 1287 |
| Jeff Manship | Change | 5 | 3 | 2 | 81.5 | -7 | 8 | 224 | 1964 |
| Jeff Manship | Sinker | 12 | 12 | 0 | 90.0 | -10 | 8 | 231 | 2499 |
| Jeff Manship | Fastball | 12 | 4 | 8 | 90.0 | -7 | 11 | 212 | 2620 |
| Jeff Manship | Cutter | 2 | 0 | 2 | 84.6 | 0 | 5 | 180 | 876 |
| Jeff Manship | Slider | 5 | 3 | 2 | 80.1 | 4 | 0 | 95 | 672 |
| Justin Berg | Sinker | 13 | 8 | 5 | 92.4 | -7 | 4 | 240 | 1781 |
| Justin Berg | Fastball | 2 | 0 | 2 | 92.1 | -4 | 5 | 219 | 1397 |
| Justin Berg | Slider | 12 | 8 | 4 | 83.8 | 0 | 4 | 174 | 725 |
| Samuel Gervacio | Sinker | 5 | 5 | 0 | 92.7 | -8 | -4 | 298 | 1818 |
| Samuel Gervacio | Fastball | 9 | 2 | 7 | 95.0 | -8 | 3 | 249 | 1801 |
| Samuel Gervacio | Slider | 14 | 2 | 12 | 86.4 | 3 | -2 | 78 | 804 |
| Trevor Bell | Change | 9 | 8 | 1 | 85.8 | -3 | 3 | 217 | 856 |
| Trevor Bell | Sinker | 1 | 1 | 0 | 91.1 | -4 | 5 | 221 | 1181 |
| Trevor Bell | Fastball | 47 | 24 | 23 | 93.7 | -2 | 9 | 191 | 1935 |
| Trevor Bell | Cutter | 5 | 5 | 0 | 85.6 | 0 | 7 | 183 | 1326 |
| Trevor Bell | Slider | 13 | 3 | 10 | 86.2 | 2 | 2 | 135 | 643 |
Berg has already been demoted by the Cubs, and his debut actually came during his second cup of coffee. Continuing the Cubs them, Caridad looks like he'll stick around until the next regular comes of the DL and Carrillo will make his first major league start Tuesday when the Padres host Chicago. Carrillo also happens to be a Chicago native who as made his way back from Tommy John surgery.
Since the samples are so very limited, there isn't a whole lot to say. But here are a few notes.
- Caridad has managed to get a .31 whiff rate on his fastball, which is impressive
- Gervacio has shown an early ability to get grounders, while Carrillo and Caridad have not
- More Carrillo - worst strike rate, whiff rate and SLGCON in the Small Sample Derby
- Manship threw the most strikes (24/36)
- Bell's slider may need to be revisited, some may have been splitters
Yea, that's all I got.