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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| John Lackey | 1-1 | 10 | 18 | .357 | 6.29 | 40 | 40 | 2 | 0 | 0 | 213.1 | 299 | 149 | 31 | 56 | 113 |
| Mat Latos | 0-2 | 7 | 15 | .318 | 6.89 | 25 | 25 | 0 | 0 | 0 | 125.1 | 158 | 96 | 18 | 51 | 80 |
| Raudel Lazo | 0-2 | 4 | 1 | .800 | 3.92 | 32 | 0 | 0 | 0 | 2 | 43.2 | 40 | 19 | 4 | 24 | 44 |
| Mike Leake | 0-2 | 1 | 3 | .250 | 8.74 | 9 | 9 | 0 | 0 | 0 | 34.0 | 56 | 33 | 3 | 10 | 22 |
| Dae-ho Lee | -1-1 | 0 | 0 | .000 | 27.00 | 3 | 0 | 0 | 0 | 0 | 7.0 | 21 | 21 | 6 | 7 | 2 |
| Jon Lester | 4-1 | 28 | 15 | .651 | 3.64 | 57 | 57 | 5 | 3 | 0 | 363.0 | 366 | 147 | 38 | 79 | 267 |
| Tim Lincecum | 0-1 | 4 | 9 | .308 | 4.31 | 23 | 23 | 1 | 1 | 0 | 131.2 | 134 | 63 | 20 | 55 | 109 |
| Francisco Liriano | 1-1 | 9 | 5 | .643 | 3.80 | 26 | 26 | 2 | 1 | 0 | 147.0 | 148 | 62 | 17 | 63 | 133 |
| Boone Logan | 0-1 | 4 | 6 | .400 | 4.88 | 97 | 0 | 0 | 0 | 4 | 110.2 | 101 | 60 | 14 | 43 | 130 |
| Michael Lorenzen | 0-2 | 0 | 2 | .000 | 5.87 | 6 | 6 | 0 | 0 | 0 | 30.2 | 31 | 20 | 4 | 12 | 28 |
| Mark Lowe | 1-1 | 4 | 5 | .444 | 3.51 | 81 | 0 | 0 | 0 | 0 | 107.2 | 109 | 42 | 11 | 40 | 93 |
| Lance Lynn | 1-1 | 9 | 16 | .360 | 5.00 | 60 | 28 | 0 | 0 | 1 | 199.2 | 202 | 111 | 25 | 91 | 173 |
| Tyler Lyons | 1-1 | 8 | 4 | .667 | 3.06 | 108 | 1 | 0 | 0 | 3 | 141.0 | 139 | 48 | 16 | 28 | 145 |
