Luis Miguel Castillo (born December 12, 1992) is a Dominican professional baseball pitcher for the Seattle Mariners of Major League Baseball (MLB). He made his MLB debut in 2017 with the Cincinnati Reds. Castillo is a two-time All-Star.

Trophies 
Milestones
Former Youth Teams 
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| SO/BB | MLB | 2025 | 3.52 |
| SO9 | MLB | 2025 | 8.1 |
| BB9 | MLB | 2025 | 2.3 |
| HR9 | MLB | 2025 | 1.1 |
| H9 | MLB | 2025 | 8.4 |
| WHIP | MLB | 2025 | 1.185 |
| Fielding Independent Pitching | MLB | 2025 | 3.88 |
| ERA+ | MLB | 2025 | 107 |
| Batters Faced | MLB | 2025 | 745 |
| Wild Pitches | MLB | 2025 | 3 |
| Balks | MLB | 2025 | 0 |
| Times Hit by a Pitch | MLB | 2025 | 7 |
| Strikeouts | MLB | 2025 | 162 |
| Intentional Bases on Balls | MLB | 2025 | 0 |
| Bases on Balls/Walks | MLB | 2025 | 46 |
| Home Runs Allowed | MLB | 2025 | 23 |
| Earned Runs Allowed | MLB | 2025 | 71 |
| Runs Allowed | MLB | 2025 | 76 |
| Hits Allowed | MLB | 2025 | 168 |
| Innings Pitched | MLB | 2025 | 180.2 |
| Saves | MLB | 2025 | 0 |
| Shutouts | MLB | 2025 | 0 |
| Complete Games | MLB | 2025 | 0 |
| Games Finished | MLB | 2025 | 0 |
| Games Started | MLB | 2025 | 32 |
| Games Pitched | MLB | 2025 | 32 |
| ERA | MLB | 2025 | 3.54 |
| Win-Loss Percentage | MLB | 2025 | .579 |
| Loss | MLB | 2025 | 8 |
| Wins | MLB | 2025 | 11 |
| Wins Above Replacement for Pitchers | MLB | 2025 | 2.1 |
|
|
| SO/BB | MLB | 2024 | 3.72 |
| SO9 | MLB | 2024 | 9.0 |
| BB9 | MLB | 2024 | 2.4 |
| HR9 | MLB | 2024 | 1.3 |
| H9 | MLB | 2024 | 8.1 |
| WHIP | MLB | 2024 | 1.169 |
| Fielding Independent Pitching | MLB | 2024 | 3.91 |
| ERA+ | MLB | 2024 | 102 |
| Batters Faced | MLB | 2024 | 719 |
| Wild Pitches | MLB | 2024 | 0 |
| Balks | MLB | 2024 | 0 |
| Home Runs Allowed | MLB | 2024 | 25 |
| Earned Runs Allowed | MLB | 2024 | 71 |
| Runs Allowed | MLB | 2024 | 73 |
| Hits Allowed | MLB | 2024 | 158 |
| Innings Pitched | MLB | 2024 | 175.1 |
| Saves | MLB | 2024 | 0 |
| Shutouts | MLB | 2024 | 0 |
| Complete Games | MLB | 2024 | 0 |
| Games Finished | MLB | 2024 | 0 |
| Games Started | MLB | 2024 | 30 |
| Games Pitched | MLB | 2024 | 30 |
| ERA | MLB | 2024 | 3.64 |
| Win-Loss Percentage | MLB | 2024 | .478 |
| Loss | MLB | 2024 | 12 |
| Wins | MLB | 2024 | 11 |
| Wins Above Replacement for Pitchers | MLB | 2024 | 1.8 |
| Positions Played | MLB | 2024 | 1 |
| Intentional Bases on Balls | MLB | 2024 | 0 |
| Sacrifice Flies | MLB | 2024 | 0 |
| Sacrifice Hits | MLB | 2024 | 0 |
| Times Hit by a Pitch | MLB | 2024 | 0 |
| GIDP | MLB | 2024 | 0 |
| Total Bases | MLB | 2024 | 0 |
| Rbat+ | MLB | 2024 | -118 |
| rOBA | MLB | 2024 | .000 |
| OPS+ | MLB | 2024 | -100 |
| OPS | MLB | 2024 | .000 |
| SLG | MLB | 2024 | .000 |
| OBP | MLB | 2024 | .000 |
| Hits/At Bats | MLB | 2024 | .000 |
| Strikeouts | MLB | 2024 | 1 |
| Bases on Balls/Walks | MLB | 2024 | 0 |
| Caught Stealing | MLB | 2024 | 0 |
| Stolen Bases | MLB | 2024 | 0 |
| Runs Batted In | MLB | 2024 | 0 |
| Home Runs | MLB | 2024 | 0 |
| Triples | MLB | 2024 | 0 |
| Doubles | MLB | 2024 | 0 |
| Hits | MLB | 2024 | 0 |
| Runs Scored | MLB | 2024 | 0 |
| At Bats | MLB | 2024 | 1 |
| Plate Appearances | MLB | 2024 | 1 |
| Games Played | MLB | 2024 | 1 |
| Wins Above Replacement for position players | MLB | 2024 | 0.0 |
|
|
| SO/BB | MLB | 2023 | 3.91 |
| SO9 | MLB | 2023 | 10.0 |
| BB9 | MLB | 2023 | 2.6 |
| HR9 | MLB | 2023 | 1.3 |
| H9 | MLB | 2023 | 7.3 |
| WHIP | MLB | 2023 | 1.096 |
| Fielding Independent Pitching | MLB | 2023 | 3.81 |
| ERA+ | MLB | 2023 | 118 |
| Batters Faced | MLB | 2023 | 802 |
| Wild Pitches | MLB | 2023 | 3 |
| Balks | MLB | 2023 | 0 |
| Times Hit by a Pitch | MLB | 2023 | 5 |
| Strikeouts | MLB | 2023 | 219 |
| Intentional Bases on Balls | MLB | 2023 | 0 |
| Bases on Balls/Walks | MLB | 2023 | 56 |
| Home Runs Allowed | MLB | 2023 | 28 |
| Earned Runs Allowed | MLB | 2023 | 73 |
| Runs Allowed | MLB | 2023 | 81 |
| Hits Allowed | MLB | 2023 | 160 |
| Innings Pitched | MLB | 2023 | 197.0 |
| Saves | MLB | 2023 | 0 |
| Shutouts | MLB | 2023 | 0 |
| Complete Games | MLB | 2023 | 0 |
| Games Finished | MLB | 2023 | 0 |
| Games Started | MLB | 2023 | 33 |
| Games Pitched | MLB | 2023 | 33 |
| ERA | MLB | 2023 | 3.34 |
| Win-Loss Percentage | MLB | 2023 | .609 |
| Loss | MLB | 2023 | 9 |
| Wins | MLB | 2023 | 14 |
| Wins Above Replacement for Pitchers | MLB | 2023 | 3.2 |
|
|
| SO/BB | MLB | 2022 | 4.53 |
| SO9 | MLB | 2022 | 10.6 |
| BB9 | MLB | 2022 | 2.3 |
| HR9 | MLB | 2022 | 0.8 |
| H9 | MLB | 2022 | 7.6 |
| WHIP | MLB | 2022 | 1.102 |
| Fielding Independent Pitching | MLB | 2022 | 2.91 |
| ERA+ | MLB | 2022 | 117 |
| Batters Faced | MLB | 2022 | 266 |
| Wild Pitches | MLB | 2022 | 0 |
| Balks | MLB | 2022 | 0 |
| Times Hit by a Pitch | MLB | 2022 | 4 |
| Strikeouts | MLB | 2022 | 77 |
| Intentional Bases on Balls | MLB | 2022 | 0 |
| Bases on Balls/Walks | MLB | 2022 | 17 |
| Home Runs Allowed | MLB | 2022 | 6 |
| Earned Runs Allowed | MLB | 2022 | 23 |
| Runs Allowed | MLB | 2022 | 26 |
| Hits Allowed | MLB | 2022 | 55 |
| Innings Pitched | MLB | 2022 | 65.1 |
| Saves | MLB | 2022 | 0 |
| Shutouts | MLB | 2022 | 0 |
| Complete Games | MLB | 2022 | 0 |
| Games Finished | MLB | 2022 | 0 |
| Games Started | MLB | 2022 | 11 |
| Games Pitched | MLB | 2022 | 11 |
| ERA | MLB | 2022 | 3.17 |
| Win-Loss Percentage | MLB | 2022 | .667 |
| Loss | MLB | 2022 | 2 |
| Wins | MLB | 2022 | 4 |
| Wins Above Replacement for Pitchers | MLB | 2022 | 1.0 |
|
|
| Positions Played | MLB | 2021 | 1 |
| Intentional Bases on Balls | MLB | 2021 | 0 |
| Sacrifice Flies | MLB | 2021 | 0 |
| Sacrifice Hits | MLB | 2021 | 9 |
| Times Hit by a Pitch | MLB | 2021 | 0 |
| GIDP | MLB | 2021 | 1 |
| Total Bases | MLB | 2021 | 10 |
| Rbat+ | MLB | 2021 | -48 |
| rOBA | MLB | 2021 | .166 |
| OPS+ | MLB | 2021 | 0 |
| OPS | MLB | 2021 | .384 |
| SLG | MLB | 2021 | .204 |
| OBP | MLB | 2021 | .180 |
| Hits/At Bats | MLB | 2021 | .163 |
| Strikeouts | MLB | 2021 | 23 |
| Bases on Balls/Walks | MLB | 2021 | 1 |
| Caught Stealing | MLB | 2021 | 0 |
| Stolen Bases | MLB | 2021 | 0 |
| Runs Batted In | MLB | 2021 | 2 |
| Home Runs | MLB | 2021 | 0 |
| Triples | MLB | 2021 | 0 |
| Doubles | MLB | 2021 | 2 |
| Hits | MLB | 2021 | 8 |
| Runs Scored | MLB | 2021 | 1 |
| At Bats | MLB | 2021 | 49 |
| Plate Appearances | MLB | 2021 | 59 |
| Games Played | MLB | 2021 | 30 |
| Wins Above Replacement for position players | MLB | 2021 | 0.1 |
|
|
| Positions Played | MLB | 2019 | 1 |
| Intentional Bases on Balls | MLB | 2019 | 0 |
| Sacrifice Flies | MLB | 2019 | 0 |
| Sacrifice Hits | MLB | 2019 | 4 |
| Times Hit by a Pitch | MLB | 2019 | 0 |
| GIDP | MLB | 2019 | 1 |
| Total Bases | MLB | 2019 | 7 |
| Rbat+ | MLB | 2019 | -93 |
| rOBA | MLB | 2019 | .090 |
| OPS+ | MLB | 2019 | -47 |
| OPS | MLB | 2019 | .210 |
| SLG | MLB | 2019 | .113 |
| OBP | MLB | 2019 | .097 |
| Hits/At Bats | MLB | 2019 | .097 |
| Strikeouts | MLB | 2019 | 32 |
| Bases on Balls/Walks | MLB | 2019 | 0 |
| Caught Stealing | MLB | 2019 | 0 |
| Stolen Bases | MLB | 2019 | 0 |
| Runs Batted In | MLB | 2019 | 0 |
| Home Runs | MLB | 2019 | 0 |
| Triples | MLB | 2019 | 0 |
| Doubles | MLB | 2019 | 1 |
| Hits | MLB | 2019 | 6 |
| Runs Scored | MLB | 2019 | 3 |
| At Bats | MLB | 2019 | 62 |
| Plate Appearances | MLB | 2019 | 66 |
| Games Played | MLB | 2019 | 31 |
| Wins Above Replacement for position players | MLB | 2019 | -0.4 |
|
|
| Positions Played | MLB | 2018 | 1 |
| Intentional Bases on Balls | MLB | 2018 | 0 |
| Sacrifice Flies | MLB | 2018 | 0 |
| Sacrifice Hits | MLB | 2018 | 4 |
| Times Hit by a Pitch | MLB | 2018 | 0 |
| GIDP | MLB | 2018 | 0 |
| Total Bases | MLB | 2018 | 7 |
| Rbat+ | MLB | 2018 | -45 |
| rOBA | MLB | 2018 | .147 |
| OPS+ | MLB | 2018 | -32 |
| OPS | MLB | 2018 | .250 |
| SLG | MLB | 2018 | .119 |
| OBP | MLB | 2018 | .131 |
| Hits/At Bats | MLB | 2018 | .102 |
| Strikeouts | MLB | 2018 | 23 |
| Bases on Balls/Walks | MLB | 2018 | 2 |
| Caught Stealing | MLB | 2018 | 0 |
| Stolen Bases | MLB | 2018 | 0 |
| Runs Batted In | MLB | 2018 | 2 |
| Home Runs | MLB | 2018 | 0 |
| Triples | MLB | 2018 | 0 |
| Doubles | MLB | 2018 | 1 |
| Hits | MLB | 2018 | 6 |
| Runs Scored | MLB | 2018 | 4 |
| At Bats | MLB | 2018 | 59 |
| Plate Appearances | MLB | 2018 | 65 |
| Games Played | MLB | 2018 | 30 |
| Wins Above Replacement for position players | MLB | 2018 | 0.0 |
|
|
| Positions Played | MLB | 2017 | 1 |
| Intentional Bases on Balls | MLB | 2017 | 0 |
| Sacrifice Flies | MLB | 2017 | 0 |
| Sacrifice Hits | MLB | 2017 | 3 |
| Times Hit by a Pitch | MLB | 2017 | 0 |
| GIDP | MLB | 2017 | 0 |
| Total Bases | MLB | 2017 | 2 |
| Rbat+ | MLB | 2017 | -102 |
| rOBA | MLB | 2017 | .083 |
| OPS+ | MLB | 2017 | -54 |
| OPS | MLB | 2017 | .169 |
| SLG | MLB | 2017 | .069 |
| OBP | MLB | 2017 | .100 |
| Hits/At Bats | MLB | 2017 | .069 |
| Strikeouts | MLB | 2017 | 11 |
| Bases on Balls/Walks | MLB | 2017 | 1 |
| Caught Stealing | MLB | 2017 | 0 |
| Stolen Bases | MLB | 2017 | 0 |
| Runs Batted In | MLB | 2017 | 1 |
| Home Runs | MLB | 2017 | 0 |
| Triples | MLB | 2017 | 0 |
| Doubles | MLB | 2017 | 0 |
| Hits | MLB | 2017 | 2 |
| Runs Scored | MLB | 2017 | 0 |
| At Bats | MLB | 2017 | 29 |
| Plate Appearances | MLB | 2017 | 33 |
| Games Played | MLB | 2017 | 14 |
| Wins Above Replacement for position players | MLB | 2017 | -0.2 |
|
|
| Positions Played | MLB | 2011 | 4H |
| Intentional Bases on Balls | MLB | 2011 | 1 |
| Sacrifice Flies | MLB | 2011 | 2 |
| Sacrifice Hits | MLB | 2011 | 11 |
| Times Hit by a Pitch | MLB | 2011 | 0 |
| GIDP | MLB | 2011 | 6 |
| Total Bases | MLB | 2011 | 66 |
| Rbat+ | MLB | 2011 | 72 |
| rOBA | MLB | 2011 | .296 |
| OPS+ | MLB | 2011 | 68 |
| OPS | MLB | 2011 | .604 |
| SLG | MLB | 2011 | .267 |
| OBP | MLB | 2011 | .337 |
| Hits/At Bats | MLB | 2011 | .235 |
| Strikeouts | MLB | 2011 | 25 |
| Bases on Balls/Walks | MLB | 2011 | 39 |
| Caught Stealing | MLB | 2011 | 3 |
| Stolen Bases | MLB | 2011 | 8 |
| Runs Batted In | MLB | 2011 | 17 |
| Home Runs | MLB | 2011 | 0 |
| Triples | MLB | 2011 | 2 |
| Doubles | MLB | 2011 | 4 |
| Hits | MLB | 2011 | 58 |
| Runs Scored | MLB | 2011 | 28 |
| At Bats | MLB | 2011 | 247 |
| Plate Appearances | MLB | 2011 | 299 |
| Games Played | MLB | 2011 | 86 |
| Wins Above Replacement for position players | MLB | 2011 | 0.3 |
|
|
| Positions Played | MLB | 2010 | 4H |
| Intentional Bases on Balls | MLB | 2010 | 1 |
| Sacrifice Flies | MLB | 2010 | 2 |
| Sacrifice Hits | MLB | 2010 | 11 |
| Times Hit by a Pitch | MLB | 2010 | 0 |
| GIDP | MLB | 2010 | 6 |
| Total Bases | MLB | 2010 | 66 |
| Rbat+ | MLB | 2010 | 72 |
| rOBA | MLB | 2010 | .296 |
| OPS+ | MLB | 2010 | 68 |
| OPS | MLB | 2010 | .604 |
| SLG | MLB | 2010 | .267 |
| OBP | MLB | 2010 | .337 |
| Hits/At Bats | MLB | 2010 | .235 |
| Strikeouts | MLB | 2010 | 25 |
| Bases on Balls/Walks | MLB | 2010 | 39 |
| Caught Stealing | MLB | 2010 | 3 |
| Stolen Bases | MLB | 2010 | 8 |
| Runs Batted In | MLB | 2010 | 17 |
| Home Runs | MLB | 2010 | 0 |
| Triples | MLB | 2010 | 2 |
| Doubles | MLB | 2010 | 4 |
| Hits | MLB | 2010 | 58 |
| Runs Scored | MLB | 2010 | 28 |
| At Bats | MLB | 2010 | 247 |
| Plate Appearances | MLB | 2010 | 299 |
| Games Played | MLB | 2010 | 86 |
| Wins Above Replacement for position players | MLB | 2010 | 0.3 |
|
|
| Positions Played | MLB | 2007 | 4 |
| Intentional Bases on Balls | MLB | 2007 | 0 |
| Sacrifice Flies | MLB | 2007 | 1 |
| Sacrifice Hits | MLB | 2007 | 5 |
| Times Hit by a Pitch | MLB | 2007 | 0 |
| GIDP | MLB | 2007 | 3 |
| Total Bases | MLB | 2007 | 123 |
| Rbat+ | MLB | 2007 | 94 |
| rOBA | MLB | 2007 | .327 |
| OPS+ | MLB | 2007 | 93 |
| OPS | MLB | 2007 | .709 |
| SLG | MLB | 2007 | .352 |
| OBP | MLB | 2007 | .356 |
| Hits/At Bats | MLB | 2007 | .304 |
| Strikeouts | MLB | 2007 | 28 |
| Bases on Balls/Walks | MLB | 2007 | 29 |
| Caught Stealing | MLB | 2007 | 4 |
| Stolen Bases | MLB | 2007 | 9 |
| Runs Batted In | MLB | 2007 | 18 |
| Home Runs | MLB | 2007 | 0 |
| Triples | MLB | 2007 | 3 |
| Doubles | MLB | 2007 | 11 |
| Hits | MLB | 2007 | 106 |
| Runs Scored | MLB | 2007 | 54 |
| At Bats | MLB | 2007 | 349 |
| Plate Appearances | MLB | 2007 | 384 |
| Games Played | MLB | 2007 | 85 |
| Wins Above Replacement for position players | MLB | 2007 | 1.4 |
|
|
| Positions Played | MLB | 2006 | *4 |
| Intentional Bases on Balls | MLB | 2006 | 0 |
| Sacrifice Flies | MLB | 2006 | 2 |
| Sacrifice Hits | MLB | 2006 | 9 |
| Times Hit by a Pitch | MLB | 2006 | 1 |
| GIDP | MLB | 2006 | 14 |
| Total Bases | MLB | 2006 | 216 |
| Rbat+ | MLB | 2006 | 94 |
| rOBA | MLB | 2006 | .333 |
| OPS+ | MLB | 2006 | 91 |
| OPS | MLB | 2006 | .728 |
| SLG | MLB | 2006 | .370 |
| OBP | MLB | 2006 | .358 |
| Hits/At Bats | MLB | 2006 | .296 |
| Strikeouts | MLB | 2006 | 58 |
| Bases on Balls/Walks | MLB | 2006 | 56 |
| Caught Stealing | MLB | 2006 | 11 |
| Stolen Bases | MLB | 2006 | 25 |
| Runs Batted In | MLB | 2006 | 49 |
| Home Runs | MLB | 2006 | 3 |
| Triples | MLB | 2006 | 6 |
| Doubles | MLB | 2006 | 22 |
| Hits | MLB | 2006 | 173 |
| Runs Scored | MLB | 2006 | 84 |
| At Bats | MLB | 2006 | 584 |
| Plate Appearances | MLB | 2006 | 652 |
| Games Played | MLB | 2006 | 142 |
| Wins Above Replacement for position players | MLB | 2006 | 2.3 |
|