Jon Lester had a record of 45-18 with an ERA of 3.20 and 449 strikeouts in 81 appearances in the month of September in his career.
| NAME | DATE | TM | OPP | DEC | GS | ERA | SO | CG | SHO | SV | IP | H | ER | R | HR | BB | HBP | GF | IBB | TBF | WP | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 1 |  | J. Lester | 9/2/2007 | vs | W | 1 | 3.00 | 1 | 0 | 0 | 0 | 6.0 | 6 | 2 | 2 | 1 | 4 | 0 | 0 | 0 | 26 | 0 | ||
| 2 | | J. Lester | 9/7/2007 | @ | W | 1 | 0.00 | 4 | 0 | 0 | 0 | 7.0 | 4 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 27 | 0 | ||
| 3 | | J. Lester | 9/12/2007 | vs | 1 | 9.82 | 5 | 0 | 0 | 0 | 3.2 | 8 | 4 | 4 | 1 | 4 | 0 | 0 | 0 | 23 | 0 | |||
| 4 | | J. Lester | 9/18/2007 | @ | 1 | 1.35 | 5 | 0 | 0 | 0 | 6.2 | 3 | 1 | 1 | 0 | 4 | 0 | 0 | 0 | 27 | 0 | |||
| 5 | | J. Lester | 9/26/2007 | vs | 1 | 8.31 | 9 | 0 | 0 | 0 | 4.1 | 7 | 4 | 5 | 2 | 3 | 0 | 0 | 0 | 23 | 0 | |||
| 6 | | J. Lester | 9/30/2007 | vs | 0 | 0.00 | 2 | 0 | 0 | 0 | 2.0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 6 | 0 | |||
| 7 | | J. Lester | 9/2/2008 | vs | W | 1 | 1.80 | 5 | 0 | 0 | 0 | 5.0 | 6 | 1 | 1 | 0 | 4 | 0 | 0 | 0 | 23 | 0 | ||
| 8 | | J. Lester | 9/8/2008 | vs | W | 1 | 0.00 | 9 | 0 | 0 | 0 | 7.2 | 6 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 30 | 0 | ||
| 9 | | J. Lester | 9/14/2008 | vs | W | 1 | 1.13 | 6 | 0 | 0 | 0 | 8.0 | 4 | 1 | 1 | 1 | 2 | 1 | 0 | 0 | 30 | 0 | ||
| 10 | | J. Lester | 9/20/2008 | @ | L | 1 | 6.43 | 4 | 0 | 0 | 0 | 7.0 | 8 | 5 | 5 | 0 | 3 | 1 | 0 | 1 | 32 | 0 | ||
| 11 | | J. Lester | 9/25/2008 | vs | W | 1 | 1.50 | 4 | 0 | 0 | 0 | 6.0 | 2 | 1 | 1 | 0 | 1 | 1 | 0 | 0 | 22 | 1 | ||
| 12 | | J. Lester | 9/1/2009 | @ | W | 1 | 3.00 | 9 | 0 | 0 | 0 | 6.0 | 7 | 2 | 2 | 1 | 2 | 0 | 0 | 0 | 27 | 0 | ||
| 13 | | J. Lester | 9/6/2009 | @ | W | 1 | 0.00 | 8 | 0 | 0 | 0 | 7.0 | 4 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 26 | 0 | ||
| 14 | | J. Lester | 9/13/2009 | vs | W | 1 | 0.00 | 7 | 0 | 0 | 0 | 8.0 | 2 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 28 | 1 | ||
| 15 | | J. Lester | 9/19/2009 | @ | W | 1 | 4.50 | 4 | 0 | 0 | 0 | 6.0 | 10 | 3 | 3 | 2 | 0 | 0 | 0 | 0 | 27 | 0 | ||
| 16 | | J. Lester | 9/25/2009 | @ | L | 1 | 19.29 | 3 | 0 | 0 | 0 | 2.1 | 8 | 5 | 5 | 1 | 3 | 0 | 0 | 0 | 18 | 0 | ||
| 17 | | J. Lester | 9/1/2010 | @ | W | 1 | 7.50 | 10 | 0 | 0 | 0 | 6.0 | 8 | 5 | 5 | 0 | 2 | 1 | 0 | 0 | 29 | 1 | ||
| 18 | | J. Lester | 9/6/2010 | vs | W | 1 | 3.00 | 10 | 0 | 0 | 0 | 6.0 | 4 | 2 | 2 | 0 | 3 | 0 | 0 | 0 | 25 | 0 | ||
| 19 | | J. Lester | 9/13/2010 | @ | W | 1 | 1.13 | 12 | 0 | 0 | 0 | 8.0 | 3 | 1 | 1 | 0 | 3 | 0 | 0 | 0 | 30 | 0 | ||
| 20 | | J. Lester | 9/19/2010 | vs | W | 1 | 0.00 | 4 | 0 | 0 | 0 | 7.0 | 4 | 0 | 0 | 0 | 4 | 0 | 0 | 0 | 29 | 0 | ||
| 21 | | J. Lester | 9/25/2010 | @ | W | 1 | 0.00 | 8 | 0 | 0 | 0 | 7.0 | 2 | 0 | 0 | 0 | 3 | 0 | 0 | 0 | 24 | 1 | ||
| 22 | | J. Lester | 9/30/2010 | @ | L | 1 | 18.00 | 5 | 0 | 0 | 0 | 4.0 | 9 | 8 | 8 | 2 | 5 | 0 | 0 | 0 | 25 | 0 | ||
| 23 | | J. Lester | 9/1/2011 | vs | 1 | 1.80 | 6 | 0 | 0 | 0 | 5.0 | 7 | 1 | 1 | 0 | 3 | 0 | 0 | 0 | 25 | 0 | |||
| 24 | | J. Lester | 9/6/2011 | @ | W | 1 | 0.00 | 11 | 0 | 0 | 0 | 7.0 | 3 | 0 | 0 | 0 | 1 | 0 | 0 | 0 | 26 | 1 | ||
| 25 | | J. Lester | 9/11/2011 | @ | L | 1 | 9.00 | 2 | 0 | 0 | 0 | 4.0 | 8 | 4 | 4 | 0 | 3 | 0 | 0 | 0 | 23 | 1 | ||
| Total | 80 | 3.20 | 449 | 2 | 0 | 0 | 492.1 | 454 | 175 | 184 | 48 | 170 | 11 | 0 | 2 | 2,050 | 13 | |||||||
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| NL East | W | L | PCT | GB |
|---|---|---|---|---|
 Braves - y | 94 | 68 | .580 | |
 Phillies - w | 88 | 74 | .543 | 6.0 |
80 | 82 | .494 | 14.0 | |
77 | 85 | .475 | 17.0 | |
74 | 88 | .457 | 20.0 | |
| NL Central | W | L | PCT | GB |
 Brewers - y | 103 | 59 | .636 | |
 Cubs - w | 89 | 73 | .549 | 14.0 |
82 | 80 | .506 | 21.0 | |
77 | 85 | .475 | 26.0 | |
75 | 87 | .463 | 28.0 | |
| NL West | W | L | PCT | GB |
 Dodgers - y | 100 | 62 | .617 | |
 Padres - w | 91 | 71 | .562 | 9.0 |
86 | 76 | .531 | 14.0 | |
65 | 97 | .401 | 35.0 | |
58 | 104 | .358 | 42.0 |
Marlins
Nationals
Mets
Pirates
Cardinals
Reds
Diamondbacks
Giants
Rockies| AL East | W | L | PCT | GB |
|---|---|---|---|---|
 Rays - y | 98 | 64 | .605 | |
 Yankees - w | 93 | 68 | .578 | 4.5 |
 Red Sox - w | 87 | 75 | .537 | 11.0 |
79 | 82 | .491 | 18.5 | |
79 | 83 | .488 | 19.0 | |
| AL Central | W | L | PCT | GB |
 Guardians - y | 85 | 77 | .525 | |
 White Sox - w | 84 | 78 | .519 | 1.0 |
77 | 85 | .475 | 8.0 | |
76 | 86 | .469 | 9.0 | |
69 | 93 | .426 | 16.0 | |
| AL West | W | L | PCT | GB |
 Astros - y | 81 | 81 | .500 | |
80 | 82 | .494 | 1.0 | |
76 | 86 | .469 | 5.0 | |
64 | 98 | .395 | 17.0 | |
62 | 100 | .383 | 19.0 |
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Royals
Rangers
Angels