| Month | Game | Strat Date | + | Away | Pitcher | Balance | At | Home | Pitcher | Balance |
| September | 1 | 9/9/2021 | VRN | Freddy Peralta | 1L | At | CUB | Patrick Corbin* | 8L | |
| September | 2 | 9/10/2021 | VRN | Max Scherzer | 1R | At | CUB | Zach Plesac | 4L | |
| September | 3 | 9/11/2021 | VRN | Zach Eflin | 2L | At | CUB | Alek Manoah | 6R | |
| September | 4 | 9/12/2021 | CUB | Pablo Lopez | E | At | TAM | Johan Oviedo | 2R | |
| September | 5 | 9/13/2021 | CUB | Jon Gray | 2L | At | TAM | Eli Morgan | 1R | |
| September | 6 | 9/14/2021 | CUB | Casey Mize | 8R | At | TAM | Brad Keller | E | |
| September | OFF | 9/15/2021 | ||||||||
| September | 7 | 9/16/2021 | + | CUB | Kyle Hendricks | 3R | At | CRC | Carlos Rodon* | 2R |
| September | 8 | 9/17/2021 | + | CUB | Pablo Lopez | E | At | CRC | Hyun-Jin Ryu* | E |
| September | 9 | 9/18/2021 | + | CUB | Joe Ross | 5R | At | CRC | Triston McKenzie | 1L |
| September | 10 | 9/19/2021 | + | CUB | Patrick Corbin* | 8L | At | CRC | Kevin Gausman | E |
| September | 11 | 9/20/2021 | + | CUB | Zach Plesac | 4L | At | CRC | Jake Odorizzi | 1R |
| September | 12 | 9/21/2021 | + | BUR | Taijuan Walker | 4L | At | CUB | Alek Manoah | 6R |
| September | 13 | 9/22/2021 | + | BUR | Lance McCullers | 3R | At | CUB | Pablo Lopez | E |
| September | 14 | 9/23/2021 | + | BUR | Luke Weaver | 3R | At | CUB | Jon Gray | 2L |
| September | 15 | 9/24/2021 | + | BUR | Adam Wainwright | 1R | At | CUB | Casey Mize | 8R |
| September | OFF | 9/25/2021 | ||||||||
| September | 16 | 9/26/2021 | SRD | Chris Paddack | 9L | At | CUB | Zach Plesac | 4L | |
| September | 17 | 9/27/2021 | SRD | Dylan Bundy | 3L | At | CUB | Alek Manoah | 6R | |
| September | 18 | 9/28/2021 | SRD | Dallas Keuchel* | 2R | At | CUB | Pablo Lopez | E | |
| September | 19 | 9/29/2021 | CUB | Jon Gray | 2L | At | HUC | Zack Greinke | 8L | |
| September | 20 | 9/30/2021 | CUB | Casey Mize | 8R | At | HUC | Cal Quantrill | 1L | |
| September | 21 | 10/1/2021 | CUB | Joe Ross | 5R | At | HUC | Luis Garcia | 7R | |
| September | 22 | 10/2/2021 | HMA | Brady Singer | 1R | At | CUB | Patrick Corbin* | 8L | |
| September | 23 | 10/3/2021 | HMA | Domingo German | 4L | At | CUB | Zach Plesac | 4L | |
| September | 24 | 10/4/2021 | HMA | Spencer Howard | 4L | At | CUB | Kyle Hendricks | 3R | |
| + Indicates In Division Game | ||||||||||