9/24 WSH: 1 IP, 0 H, 0 BB, 0 ER, 0 K

9/26 PHI: 3 IP, 2 H, 4 BB, 1 ER, 1 K (L)

9/26 CIN: 1 IP, 0 H, 1 BB, 0 ER, 1 K

9/27 CIN: 5.2 IP, 5 H, 1 BB, 1 WP, 1 ER, 5 K (W)

Sanmartin allowed a singular run in each of his 2021 appearances, recording the win in both.

9/28 CIN: 1.1 IP, 2 H, 3 BB, 2 ER, 2 K (L)

9/29 PIT: 3 IP, 3 H, 1 BB, 0 ER, 4 K

9/29 CHC: 1-1

9/30 KC: 5 IP, 3 H, 1 BB, 0 ER, 2 R, 4 K (L)

Zerpa entered the year without any experience above the rookie level. 0 ER in his debut assured he'd end 2021 with a spotless Majors ERA.

9/30 CHC: 0-1

As the Cubs marched towards a new MLB record for players used in a season, Castillo became their eighth catcher used.

10/1 ATL: 1 IP, 2 H, 0 BB, 1 ER, 0 K

Strider concluded a valiant run through the ATL system on October 1st, having only pitched 12 innings since the 2018 season in any capacity, and none in pro ball coming into the 2021 season. Starting at Low-A, he earned four promotions to get to ATL, tallying a 14.6 K/9 along the way. His final appearance of the year for Atlanta saw him capture the win in the club's regular season bow.