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| "L" Pitching Register | |
| Batting Register | Pitching Glossary |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO | PWS |
| Dave Labarbera | 2009-2021 | 13 | 8 | .619 | 6.04 | 204 | 0 | 0 | 0 | 7 | 241.3 | 305 | 162 | 28 | 166 | 145 | 4.8 |
| Harry Lachie | 2019-2019 | 3 | 7 | .300 | 5.45 | 14 | 12 | 0 | 0 | 0 | 77.7 | 90 | 47 | 8 | 29 | 29 | 0.9 |
| John Lackey | 2003-2013 | 55 | 68 | .447 | 4.67 | 206 | 163 | 10 | 2 | 6 | 1097.0 | 1139 | 569 | 178 | 325 | 650 | 46.2 |
| Joaquin Lamela | 2018-2021 | 58 | 42 | .580 | 3.78 | 132 | 132 | 11 | 4 | 0 | 881.3 | 877 | 370 | 90 | 192 | 578 | 58.4 |
| William Lanclos | 2021-2021 | 0 | 0 | .000 | 3.00 | 2 | 0 | 0 | 0 | 0 | 3.0 | 2 | 1 | 0 | 2 | 2 | 0.2 |
| Gary Landers | 2021-2021 | 2 | 1 | .667 | 4.77 | 4 | 4 | 0 | 0 | 0 | 28.3 | 30 | 15 | 3 | 4 | 13 | 0.8 |
| Michael Lansing | 2021-2021 | 0 | 6 | .000 | 5.96 | 12 | 8 | 0 | 0 | 0 | 51.3 | 51 | 34 | 5 | 26 | 44 | 0.0 |
| Preston Larrison | 2006-2014 | 52 | 66 | .441 | 5.03 | 208 | 139 | 5 | 2 | 3 | 1013.6 | 1107 | 567 | 108 | 484 | 590 | 45.2 |
| Brian Lawrence | 2002-2007 | 2 | 2 | .500 | 5.40 | 21 | 7 | 1 | 1 | 1 | 56.7 | 69 | 34 | 4 | 24 | 45 | 1.5 |
| Scotty Layfield | 2005-2012 | 28 | 15 | .651 | 4.37 | 388 | 1 | 0 | 0 | 24 | 412.3 | 393 | 200 | 53 | 155 | 306 | 32.7 |
| Oswaldo Leal | 2014-2021 | 15 | 11 | .577 | 4.74 | 225 | 0 | 0 | 0 | 5 | 269.6 | 290 | 142 | 29 | 77 | 169 | 11.4 |
| Thomas Lecroy | 2015-2015 | 0 | 0 | .000 | 18.00 | 2 | 0 | 0 | 0 | 0 | 1.0 | 3 | 2 | 1 | 0 | 1 | 0.0 |
| Cliff Lee | 2003-2016 | 98 | 97 | .503 | 4.29 | 337 | 263 | 10 | 4 | 0 | 1674.6 | 1616 | 799 | 163 | 718 | 1260 | 97.7 |
| Travis Lee Jr. | 2013-2014 | 9 | 22 | .290 | 5.13 | 60 | 34 | 1 | 0 | 9 | 247.3 | 285 | 141 | 42 | 68 | 117 | 6.1 |
| Matt Lee | 2021-2021 | 4 | 9 | .308 | 4.46 | 18 | 18 | 0 | 0 | 0 | 111.0 | 104 | 55 | 12 | 49 | 95 | 4.4 |
| Brian Lefebvre | 2013-2021 | 42 | 51 | .452 | 4.65 | 285 | 96 | 2 | 0 | 69 | 765.0 | 871 | 395 | 79 | 176 | 460 | 43.5 |
| Scott Leist | 2014-2019 | 6 | 9 | .400 | 6.36 | 43 | 14 | 0 | 0 | 2 | 116.0 | 143 | 82 | 18 | 68 | 65 | 4.0 |
| Richie Lentz | 2011-2017 | 18 | 24 | .429 | 4.57 | 140 | 41 | 6 | 1 | 6 | 480.3 | 513 | 244 | 54 | 175 | 284 | 20.1 |
| Lamont Leon | 2013-2021 | 40 | 46 | .465 | 3.66 | 603 | 0 | 0 | 0 | 159 | 672.0 | 664 | 273 | 76 | 84 | 562 | 81.8 |
| Robert Lester | 2020-2021 | 5 | 5 | .500 | 4.30 | 84 | 0 | 0 | 0 | 1 | 102.7 | 103 | 49 | 7 | 32 | 67 | 6.8 |
| Robert Letourneau | 2018-2021 | 5 | 8 | .385 | 3.90 | 152 | 0 | 0 | 0 | 7 | 157.0 | 147 | 68 | 12 | 80 | 114 | 9.0 |
| Colby Lewis | 2003-2010 | 11 | 16 | .407 | 5.93 | 69 | 30 | 1 | 0 | 0 | 238.3 | 254 | 157 | 37 | 125 | 191 | 7.2 |
| Brad Lidge | 2003-2013 | 52 | 33 | .612 | 3.72 | 251 | 118 | 0 | 0 | 26 | 792.0 | 683 | 327 | 76 | 334 | 775 | 63.7 |
| Kerry Ligtenberg | 1998-2009 | 7 | 5 | .583 | 4.62 | 139 | 0 | 0 | 0 | 14 | 169.3 | 173 | 87 | 14 | 89 | 87 | 11.1 |
| Ted Lilly | 2000-2010 | 22 | 29 | .431 | 4.67 | 100 | 69 | 0 | 0 | 1 | 439.3 | 435 | 228 | 68 | 180 | 296 | 18.5 |
| Ramon Limones | 2014-2021 | 30 | 56 | .349 | 5.17 | 175 | 110 | 18 | 2 | 2 | 810.0 | 1027 | 465 | 76 | 175 | 288 | 20.2 |
| Santiago Limones | 2019-2020 | 0 | 5 | .000 | 5.85 | 68 | 1 | 0 | 0 | 6 | 87.7 | 101 | 57 | 16 | 54 | 42 | 0.1 |
| Scott Linebrink | 2001-2010 | 10 | 14 | .417 | 5.17 | 165 | 0 | 0 | 0 | 7 | 181.0 | 211 | 104 | 22 | 90 | 100 | 7.3 |
| Anthony Liotta | 2015-2019 | 19 | 37 | .339 | 4.06 | 346 | 0 | 0 | 0 | 108 | 376.7 | 424 | 170 | 50 | 53 | 225 | 31.8 |
| Joel Lippincott | 2011-2018 | 22 | 24 | .478 | 4.54 | 137 | 48 | 0 | 0 | 5 | 426.6 | 454 | 215 | 57 | 119 | 277 | 22.0 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO | PWS |
| Francisco Liriano | 2007-2016 | 15 | 26 | .366 | 5.85 | 123 | 54 | 0 | 0 | 5 | 349.0 | 400 | 227 | 69 | 122 | 260 | 10.2 |
| Wes Littleton | 2005-2020 | 159 | 123 | .564 | 3.50 | 457 | 414 | 17 | 7 | 0 | 2637.9 | 2740 | 1026 | 186 | 498 | 1806 | 179.1 |
| Bobby Livingston | 2007-2009 | 4 | 7 | .364 | 5.79 | 13 | 13 | 1 | 0 | 0 | 82.3 | 108 | 53 | 10 | 29 | 30 | 2.2 |
| Jack Llewellyn | 2020-2021 | 6 | 6 | .500 | 2.98 | 97 | 0 | 0 | 0 | 45 | 120.7 | 111 | 40 | 12 | 24 | 66 | 21.6 |
| Adam Loewen | 2008-2021 | 165 | 134 | .552 | 4.05 | 423 | 369 | 53 | 16 | 2 | 2604.3 | 2575 | 1172 | 288 | 782 | 1840 | 140.4 |
| William Lofland | 2012-2021 | 105 | 125 | .457 | 4.25 | 331 | 288 | 50 | 7 | 1 | 2118.6 | 2073 | 1001 | 275 | 488 | 1789 | 102.7 |
| James Logan | 2016-2019 | 37 | 56 | .398 | 4.21 | 133 | 133 | 11 | 0 | 0 | 866.3 | 857 | 405 | 115 | 248 | 607 | 29.7 |
| Richard Lolley | 2020-2020 | 0 | 0 | .000 | 20.30 | 2 | 0 | 0 | 0 | 0 | 1.3 | 4 | 3 | 0 | 4 | 0 | 0.0 |
| Aaron Looper | 2007-2013 | 32 | 21 | .604 | 5.17 | 385 | 0 | 0 | 0 | 6 | 485.6 | 534 | 279 | 68 | 166 | 298 | 26.7 |
| Braden Looper | 1999-2012 | 21 | 17 | .553 | 4.67 | 363 | 0 | 0 | 0 | 25 | 360.3 | 372 | 187 | 46 | 147 | 241 | 28.1 |
| Aquilino Lopez | 2004-2010 | 18 | 18 | .500 | 5.38 | 183 | 0 | 0 | 0 | 5 | 251.0 | 273 | 150 | 31 | 87 | 121 | 13.1 |
| Felipe Lopez | 2019-2021 | 4 | 10 | .286 | 5.24 | 142 | 0 | 0 | 0 | 3 | 257.7 | 314 | 150 | 31 | 55 | 125 | 8.4 |
| Leon Lopez | 2020-2020 | 1 | 1 | .500 | 5.13 | 15 | 2 | 0 | 0 | 1 | 26.3 | 29 | 15 | 1 | 14 | 13 | 0.8 |
| Pedro Lopez | 2013-2021 | 122 | 93 | .567 | 3.64 | 265 | 265 | 42 | 9 | 0 | 1906.3 | 1897 | 771 | 152 | 567 | 1486 | 123.8 |
| Rodrigo Lopez | 2002-2007 | 5 | 10 | .333 | 5.37 | 20 | 20 | 0 | 0 | 0 | 105.7 | 136 | 63 | 18 | 29 | 58 | 0.0 |
| Jason Loveless | 2013-2019 | 12 | 8 | .600 | 5.37 | 180 | 0 | 0 | 0 | 3 | 228.0 | 262 | 136 | 36 | 111 | 156 | 9.6 |
| Derek Lowe | 1998-2011 | 51 | 63 | .447 | 5.03 | 150 | 150 | 11 | 3 | 0 | 956.0 | 1060 | 534 | 132 | 278 | 623 | 41.6 |
| Noah Lowry | 2007-2017 | 98 | 72 | .576 | 3.93 | 299 | 260 | 3 | 0 | 3 | 1585.3 | 1534 | 692 | 198 | 400 | 1126 | 100.1 |
| Felipe Lozano | 2019-2021 | 13 | 4 | .765 | 3.39 | 112 | 1 | 0 | 0 | 4 | 135.3 | 107 | 51 | 11 | 93 | 156 | 11.6 |
| Ruddy Lugo | 2006-2015 | 32 | 21 | .604 | 4.18 | 511 | 1 | 0 | 0 | 13 | 549.0 | 517 | 255 | 65 | 234 | 407 | 37.2 |
| Trey Lunsford | 2006-2012 | 1 | 0 | 1.000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 2.0 | 1 | 0 | 0 | 1 | 0 | 0.5 |
| David Luttrell | 2018-2021 | 11 | 17 | .393 | 4.13 | 178 | 4 | 0 | 0 | 32 | 242.0 | 275 | 111 | 20 | 65 | 119 | 16.5 |
| Brandon Lyon | 2002-2015 | 48 | 70 | .407 | 4.73 | 245 | 164 | 15 | 5 | 2 | 1190.0 | 1259 | 626 | 188 | 364 | 801 | 52.2 |
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