FanGraphs Depth Chart projections are a combination of ZiPS and Steamer projections with playing time allocated by our staff.
| Edwin Diaz | | Mariners | 4 | 3 | 28 | 8 | 2.63 | 0 | 65 | 65.0 | 45 | 19 | 6 | 94 | 22 | 1.02 | 13.04 | 3.01 | 2.57 | 2.0 |
| Chris Sale | | Red Sox | 17 | 7 | 0 | 0 | 2.75 | 32 | 32 | 204.0 | 151 | 63 | 21 | 278 | 46 | 0.97 | 12.27 | 2.02 | 2.62 | 6.6 |
| Craig Kimbrel | | | 4 | 3 | 0 | 0 | 2.79 | 0 | 65 | 65.0 | 44 | 20 | 6 | 98 | 26 | 1.07 | 13.61 | 3.61 | 2.71 | 2.1 |
| Dellin Betances | | Yankees | 5 | 3 | 7 | 18 | 2.85 | 0 | 75 | 75.0 | 50 | 24 | 7 | 112 | 33 | 1.11 | 13.46 | 3.98 | 2.80 | 2.1 |
| Jacob deGrom | | Mets | 14 | 10 | 0 | 0 | 2.95 | 32 | 32 | 210.0 | 172 | 69 | 21 | 256 | 53 | 1.07 | 10.97 | 2.25 | 2.83 | 5.9 |
| Aroldis Chapman | | Yankees | 4 | 2 | 28 | 8 | 2.77 | 0 | 65 | 65.0 | 44 | 20 | 6 | 97 | 29 | 1.12 | 13.45 | 4.01 | 2.89 | 2.0 |
| Felipe Vazquez | | Pirates | 4 | 3 | 28 | 7 | 2.94 | 0 | 65 | 65.0 | 52 | 21 | 5 | 82 | 23 | 1.16 | 11.34 | 3.19 | 2.91 | 1.6 |
| Josh Hader | | Brewers | 5 | 3 | 7 | 19 | 2.95 | 0 | 80 | 80.0 | 54 | 26 | 9 | 121 | 35 | 1.12 | 13.57 | 3.93 | 3.00 | 1.8 |
| Corey Knebel | | Brewers | 4 | 3 | 28 | 4 | 3.04 | 0 | 65 | 65.0 | 47 | 22 | 6 | 92 | 28 | 1.16 | 12.72 | 3.86 | 3.01 | 1.5 |
| Max Scherzer | | Nationals | 15 | 9 | 0 | 0 | 3.12 | 32 | 32 | 210.0 | 163 | 73 | 26 | 275 | 54 | 1.03 | 11.77 | 2.31 | 3.02 | 5.8 |
| Andrew Miller | | | 4 | 3 | 0 | 0 | 3.07 | 0 | 65 | 65.0 | 52 | 22 | 6 | 83 | 23 | 1.14 | 11.50 | 3.17 | 3.07 | 0.7 |
| Ray Black | | Giants | 2 | 1 | 0 | 3 | 3.01 | 0 | 30 | 30.0 | 21 | 10 | 3 | 42 | 14 | 1.18 | 12.58 | 4.33 | 3.09 | 0.2 |
| Blake Treinen | | Athletics | 4 | 3 | 30 | 6 | 3.08 | 0 | 70 | 70.0 | 60 | 24 | 5 | 79 | 25 | 1.20 | 10.10 | 3.19 | 3.09 | 1.5 |
| Keone Kela | | Pirates | 3 | 3 | 6 | 14 | 3.25 | 0 | 60 | 60.0 | 48 | 22 | 6 | 76 | 23 | 1.19 | 11.42 | 3.44 | 3.12 | 1.4 |
| Trevor Rosenthal | | Nationals | 4 | 3 | 6 | 18 | 3.09 | 0 | 65 | 65.0 | 50 | 22 | 6 | 84 | 28 | 1.21 | 11.66 | 3.89 | 3.15 | 1.3 |
| Will Smith | | Giants | 3 | 3 | 28 | 7 | 3.08 | 0 | 65 | 65.0 | 52 | 22 | 6 | 78 | 24 | 1.17 | 10.84 | 3.32 | 3.18 | 1.3 |
| Diego Castillo | | Rays | 3 | 3 | 6 | 14 | 3.12 | 0 | 60 | 60.0 | 48 | 21 | 6 | 73 | 22 | 1.16 | 10.98 | 3.26 | 3.18 | 1.3 |
| Kirby Yates | | Padres | 3 | 3 | 28 | 6 | 3.29 | 0 | 65 | 65.0 | 51 | 24 | 7 | 84 | 22 | 1.14 | 11.66 | 3.11 | 3.20 | 1.3 |
| James Paxton | | Mariners | 13 | 9 | 0 | 0 | 3.25 | 31 | 31 | 185.0 | 157 | 67 | 21 | 214 | 51 | 1.13 | 10.44 | 2.50 | 3.21 | 4.4 |
| Matt Barnes | | Red Sox | 4 | 3 | 6 | 16 | 3.27 | 0 | 65 | 65.0 | 51 | 24 | 6 | 82 | 27 | 1.21 | 11.38 | 3.79 | 3.23 | 1.2 |
| Zach Britton | | | 4 | 3 | 0 | 0 | 3.01 | 0 | 65 | 65.0 | 60 | 22 | 3 | 63 | 26 | 1.32 | 8.76 | 3.65 | 3.24 | 0.2 |
| Ryan Pressly | | Astros | 4 | 3 | 6 | 16 | 3.32 | 0 | 65 | 65.0 | 55 | 24 | 7 | 78 | 22 | 1.18 | 10.79 | 3.09 | 3.25 | 1.1 |
| David Robertson | | | 3 | 3 | 0 | 0 | 3.32 | 0 | 65 | 65.0 | 53 | 24 | 7 | 81 | 25 | 1.19 | 11.22 | 3.42 | 3.26 | 1.2 |
| Justin Verlander | | Astros | 15 | 8 | 0 | 0 | 3.36 | 32 | 32 | 205.0 | 167 | 76 | 27 | 254 | 52 | 1.07 | 11.14 | 2.28 | 3.28 | 5.2 |
| Kenley Jansen | | Dodgers | 4 | 3 | 28 | 8 | 3.34 | 0 | 65 | 65.0 | 53 | 24 | 8 | 78 | 16 | 1.06 | 10.75 | 2.22 | 3.29 | 1.3 |
| Noah Syndergaard | | Mets | 11 | 10 | 0 | 0 | 3.55 | 29 | 29 | 176.0 | 162 | 69 | 18 | 183 | 46 | 1.18 | 9.34 | 2.34 | 3.29 | 3.6 |
| Walker Buehler | | Dodgers | 12 | 8 | 0 | 0 | 3.29 | 28 | 28 | 163.0 | 139 | 59 | 17 | 186 | 54 | 1.18 | 10.30 | 2.98 | 3.30 | 3.3 |
| Blake Snell | | Rays | 13 | 9 | 0 | 0 | 3.23 | 32 | 32 | 192.0 | 153 | 69 | 20 | 235 | 77 | 1.19 | 11.01 | 3.59 | 3.31 | 4.0 |
| Clayton Kershaw | | Dodgers | 13 | 8 | 0 | 0 | 3.25 | 29 | 29 | 185.0 | 172 | 67 | 21 | 181 | 36 | 1.12 | 8.78 | 1.76 | 3.32 | 3.7 |
| Chad Green | | Yankees | 4 | 3 | 4 | 23 | 3.33 | 0 | 75 | 75.0 | 61 | 28 | 10 | 94 | 21 | 1.10 | 11.32 | 2.58 | 3.32 | 1.4 |