FanGraphs Depth Chart projections are a combination of ZiPS and Steamer projections with playing time allocated by our staff.
| Edwin Diaz | | Mets | 4 | 3 | 31 | 7 | 2.45 | 0 | 65 | 65.0 | 43 | 18 | 5 | 97 | 22 | 1.00 | 13.42 | 3.03 | 2.36 | 2.1 |
| Chris Sale | | Red Sox | 17 | 7 | 0 | 0 | 2.77 | 32 | 32 | 204.0 | 152 | 63 | 21 | 278 | 46 | 0.97 | 12.24 | 2.02 | 2.63 | 6.6 |
| Craig Kimbrel | | | 4 | 3 | 19 | 0 | 2.80 | 0 | 65 | 65.0 | 44 | 20 | 6 | 98 | 26 | 1.07 | 13.56 | 3.61 | 2.73 | 2.1 |
| Dellin Betances | | Yankees | 5 | 3 | 1 | 20 | 2.84 | 0 | 75 | 75.0 | 50 | 24 | 7 | 112 | 33 | 1.11 | 13.42 | 3.98 | 2.81 | 1.5 |
| Jacob deGrom | | Mets | 14 | 10 | 0 | 0 | 2.93 | 32 | 32 | 210.0 | 171 | 68 | 21 | 255 | 52 | 1.06 | 10.92 | 2.24 | 2.84 | 5.9 |
| Aroldis Chapman | | Yankees | 4 | 2 | 28 | 8 | 2.75 | 0 | 65 | 65.0 | 43 | 20 | 6 | 97 | 29 | 1.11 | 13.40 | 4.01 | 2.91 | 2.0 |
| Felipe Vazquez | | Pirates | 4 | 3 | 28 | 7 | 2.93 | 0 | 65 | 65.0 | 52 | 21 | 5 | 82 | 23 | 1.16 | 11.33 | 3.19 | 2.91 | 1.6 |
| Andrew Miller | | Cardinals | 3 | 2 | 16 | 13 | 2.95 | 0 | 60 | 60.0 | 47 | 20 | 5 | 76 | 21 | 1.13 | 11.43 | 3.09 | 2.94 | 1.3 |
| Josh Hader | | Brewers | 5 | 3 | 3 | 22 | 2.96 | 0 | 80 | 80.0 | 54 | 26 | 9 | 121 | 35 | 1.12 | 13.58 | 3.93 | 3.00 | 1.8 |
| Corey Knebel | | Brewers | 4 | 3 | 28 | 4 | 3.06 | 0 | 65 | 65.0 | 47 | 22 | 6 | 92 | 28 | 1.16 | 12.71 | 3.87 | 3.01 | 1.5 |
| Max Scherzer | | Nationals | 15 | 9 | 0 | 0 | 3.13 | 32 | 32 | 210.0 | 164 | 73 | 26 | 275 | 54 | 1.04 | 11.74 | 2.32 | 3.03 | 5.8 |
| Blake Treinen | | Athletics | 4 | 3 | 33 | 4 | 3.09 | 0 | 70 | 70.0 | 60 | 24 | 5 | 78 | 25 | 1.21 | 10.06 | 3.19 | 3.10 | 1.5 |
| Ray Black | | Giants | 2 | 1 | 0 | 5 | 3.02 | 0 | 30 | 30.0 | 21 | 10 | 3 | 42 | 14 | 1.19 | 12.54 | 4.33 | 3.10 | 0.1 |
| Keone Kela | | Pirates | 3 | 3 | 6 | 13 | 3.25 | 0 | 60 | 60.0 | 48 | 22 | 6 | 76 | 23 | 1.19 | 11.42 | 3.44 | 3.12 | 1.4 |
| David Robertson | | Phillies | 3 | 3 | 27 | 6 | 3.22 | 0 | 65 | 65.0 | 51 | 23 | 7 | 86 | 25 | 1.16 | 11.90 | 3.42 | 3.14 | 1.4 |
| Trevor Rosenthal | | Nationals | 4 | 3 | 6 | 18 | 3.11 | 0 | 65 | 65.0 | 51 | 22 | 6 | 84 | 28 | 1.21 | 11.61 | 3.89 | 3.16 | 1.2 |
| Diego Castillo | | Rays | 3 | 3 | 4 | 15 | 3.13 | 0 | 60 | 60.0 | 48 | 21 | 6 | 73 | 22 | 1.16 | 10.98 | 3.27 | 3.18 | 1.3 |
| Will Smith | | Giants | 3 | 3 | 31 | 4 | 3.10 | 0 | 65 | 65.0 | 52 | 22 | 6 | 78 | 24 | 1.17 | 10.81 | 3.32 | 3.19 | 1.3 |
| Kirby Yates | | Padres | 3 | 3 | 31 | 4 | 3.25 | 0 | 65 | 65.0 | 51 | 23 | 7 | 84 | 22 | 1.13 | 11.60 | 3.11 | 3.21 | 1.3 |
| Matt Barnes | | Red Sox | 4 | 3 | 8 | 14 | 3.28 | 0 | 65 | 65.0 | 52 | 24 | 6 | 82 | 27 | 1.21 | 11.37 | 3.79 | 3.24 | 1.2 |
| Ryan Pressly | | Astros | 4 | 3 | 6 | 15 | 3.33 | 0 | 65 | 65.0 | 55 | 24 | 7 | 78 | 22 | 1.18 | 10.76 | 3.09 | 3.26 | 1.1 |
| Justin Verlander | | Astros | 15 | 8 | 0 | 0 | 3.37 | 32 | 32 | 205.0 | 167 | 77 | 27 | 253 | 52 | 1.07 | 11.11 | 2.28 | 3.29 | 5.1 |
| Kenley Jansen | | Dodgers | 4 | 3 | 29 | 8 | 3.33 | 0 | 65 | 65.0 | 53 | 24 | 8 | 77 | 16 | 1.06 | 10.72 | 2.22 | 3.29 | 1.3 |
| Noah Syndergaard | | Mets | 11 | 10 | 0 | 0 | 3.51 | 29 | 29 | 176.0 | 161 | 69 | 18 | 183 | 46 | 1.17 | 9.32 | 2.34 | 3.29 | 3.6 |
| Walker Buehler | | Dodgers | 12 | 8 | 0 | 0 | 3.27 | 28 | 28 | 163.0 | 138 | 59 | 16 | 186 | 54 | 1.18 | 10.29 | 2.98 | 3.30 | 3.3 |
| Jeurys Familia | | Mets | 3 | 3 | 6 | 14 | 3.27 | 0 | 65 | 65.0 | 56 | 24 | 5 | 73 | 26 | 1.25 | 10.05 | 3.59 | 3.31 | 1.0 |
| Blake Snell | | Rays | 13 | 10 | 0 | 0 | 3.24 | 32 | 32 | 192.0 | 153 | 69 | 20 | 235 | 77 | 1.20 | 11.01 | 3.59 | 3.31 | 4.0 |
| Chad Green | | Yankees | 4 | 3 | 1 | 18 | 3.32 | 0 | 70 | 70.0 | 57 | 26 | 9 | 88 | 20 | 1.09 | 11.29 | 2.58 | 3.32 | 0.8 |
| Clayton Kershaw | | Dodgers | 13 | 8 | 0 | 0 | 3.23 | 29 | 29 | 185.0 | 171 | 67 | 21 | 180 | 36 | 1.12 | 8.74 | 1.76 | 3.32 | 3.7 |
| Joe Kelly | | Dodgers | 4 | 3 | 6 | 15 | 3.21 | 0 | 65 | 65.0 | 55 | 23 | 6 | 73 | 24 | 1.22 | 10.06 | 3.33 | 3.33 | 1.0 |