Dominic Joseph Leone (born October 26, 1991), nicknamed "Dominator", is an American former professional baseball pitcher. He played in Major League Baseball (MLB) for the Seattle Mariners, Arizona Diamondbacks, Toronto Blue Jays, St. Louis Cardinals, Cleveland Indians, San Francisco Giants, New York Mets, Los Angeles Angels, and Chicago White Sox. Leone played college baseball for the Clemson Tigers. The Mariners selected Leone in the 16th round of the 2012 Major League Baseball draft.
High school and college
Leone attended Norwich Free Academy in Norwich, Connecticut, where he played for the school's baseball team. Undrafted out of high school, he enrolled at Clemson University, where he pitched for the Clemson Tigers baseball team.
When he was a true freshman, the Tigers turned to Leone in a game in which they faced postseason elimination; Leone won the game, which sent the team to the 2010 College World Series. A strained shoulder in his sophomore year led him to develop his off-speed pitches. After the 2011 season, he played collegiate summer baseball with the Chatham Anglers of the Cape Cod Baseball League. In his junior year, he had a 7–4 win–loss record and a 5.25 earned run average (ERA). While struggling in his junior year, Leone taught himself to throw a cutter by watching YouTube videos of Mariano Rivera.
Trophies 
Milestones
Former Youth Teams
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| SO/BB | MLB | 2024 | 1.21 |
| SO9 | MLB | 2024 | 8.1 |
| BB9 | MLB | 2024 | 6.6 |
| HR9 | MLB | 2024 | 1.9 |
| H9 | MLB | 2024 | 9.5 |
| WHIP | MLB | 2024 | 1.789 |
| Fielding Independent Pitching | MLB | 2024 | 6.32 |
| ERA+ | MLB | 2024 | 63 |
| Batters Faced | MLB | 2024 | 89 |
| Wild Pitches | MLB | 2024 | 2 |
| Balks | MLB | 2024 | 0 |
| Times Hit by a Pitch | MLB | 2024 | 0 |
| Strikeouts | MLB | 2024 | 17 |
| Intentional Bases on Balls | MLB | 2024 | 1 |
| Bases on Balls/Walks | MLB | 2024 | 14 |
| Home Runs Allowed | MLB | 2024 | 4 |
| Earned Runs Allowed | MLB | 2024 | 14 |
| Runs Allowed | MLB | 2024 | 17 |
| Hits Allowed | MLB | 2024 | 20 |
| Innings Pitched | MLB | 2024 | 19.0 |
| Saves | MLB | 2024 | 0 |
| Shutouts | MLB | 2024 | 0 |
| Complete Games | MLB | 2024 | 0 |
| Games Finished | MLB | 2024 | 4 |
| Games Started | MLB | 2024 | 0 |
| Games Pitched | MLB | 2024 | 23 |
| ERA | MLB | 2024 | 6.63 |
| Win-Loss Percentage | MLB | 2024 | .000 |
| Loss | MLB | 2024 | 2 |
| Wins | MLB | 2024 | 0 |
| Wins Above Replacement for Pitchers | MLB | 2024 | -0.7 |
|
|
| SO/BB | MLB | 2023 | 1.22 |
| SO9 | MLB | 2023 | 7.6 |
| BB9 | MLB | 2023 | 6.2 |
| HR9 | MLB | 2023 | 1.4 |
| H9 | MLB | 2023 | 10.4 |
| WHIP | MLB | 2023 | 1.846 |
| Fielding Independent Pitching | MLB | 2023 | 5.64 |
| ERA+ | MLB | 2023 | 83 |
| Batters Faced | MLB | 2023 | 61 |
| Wild Pitches | MLB | 2023 | 2 |
| Balks | MLB | 2023 | 0 |
| Times Hit by a Pitch | MLB | 2023 | 0 |
| Strikeouts | MLB | 2023 | 11 |
| Intentional Bases on Balls | MLB | 2023 | 1 |
| Bases on Balls/Walks | MLB | 2023 | 9 |
| Home Runs Allowed | MLB | 2023 | 2 |
| Earned Runs Allowed | MLB | 2023 | 8 |
| Runs Allowed | MLB | 2023 | 8 |
| Hits Allowed | MLB | 2023 | 15 |
| Innings Pitched | MLB | 2023 | 13.0 |
| Saves | MLB | 2023 | 1 |
| Shutouts | MLB | 2023 | 0 |
| Complete Games | MLB | 2023 | 0 |
| Games Finished | MLB | 2023 | 3 |
| Games Started | MLB | 2023 | 0 |
| Games Pitched | MLB | 2023 | 11 |
| ERA | MLB | 2023 | 5.54 |
| Loss | MLB | 2023 | 0 |
| Wins | MLB | 2023 | 0 |
| Wins Above Replacement for Pitchers | MLB | 2023 | 0.0 |
|
|
| Positions Played | MLB | 2021 | 1 |
| Intentional Bases on Balls | MLB | 2021 | 0 |
| Sacrifice Flies | MLB | 2021 | 0 |
| Sacrifice Hits | MLB | 2021 | 0 |
| Times Hit by a Pitch | MLB | 2021 | 0 |
| GIDP | MLB | 2021 | 0 |
| Total Bases | MLB | 2021 | 0 |
| Strikeouts | MLB | 2021 | 0 |
| Bases on Balls/Walks | MLB | 2021 | 0 |
| Caught Stealing | MLB | 2021 | 0 |
| Stolen Bases | MLB | 2021 | 0 |
| Runs Batted In | MLB | 2021 | 0 |
| Home Runs | MLB | 2021 | 0 |
| Triples | MLB | 2021 | 0 |
| Doubles | MLB | 2021 | 0 |
| Hits | MLB | 2021 | 0 |
| Runs Scored | MLB | 2021 | 0 |
| At Bats | MLB | 2021 | 0 |
| Plate Appearances | MLB | 2021 | 0 |
| Games Played | MLB | 2021 | 51 |
| Wins Above Replacement for position players | MLB | 2021 | 0.0 |
|
|
| SO/BB | MLB | 2020 | 3.20 |
| SO9 | MLB | 2020 | 14.9 |
| BB9 | MLB | 2020 | 4.7 |
| HR9 | MLB | 2020 | 2.8 |
| H9 | MLB | 2020 | 13.0 |
| WHIP | MLB | 2020 | 1.966 |
| Fielding Independent Pitching | MLB | 2020 | 5.47 |
| ERA+ | MLB | 2020 | 55 |
| Batters Faced | MLB | 2020 | 47 |
| Wild Pitches | MLB | 2020 | 1 |
| Balks | MLB | 2020 | 0 |
| Times Hit by a Pitch | MLB | 2020 | 0 |
| Strikeouts | MLB | 2020 | 16 |
| Intentional Bases on Balls | MLB | 2020 | 0 |
| Bases on Balls/Walks | MLB | 2020 | 5 |
| Home Runs Allowed | MLB | 2020 | 3 |
| Earned Runs Allowed | MLB | 2020 | 9 |
| Runs Allowed | MLB | 2020 | 9 |
| Hits Allowed | MLB | 2020 | 14 |
| Innings Pitched | MLB | 2020 | 9.2 |
| Saves | MLB | 2020 | 0 |
| Shutouts | MLB | 2020 | 0 |
| Complete Games | MLB | 2020 | 0 |
| Games Finished | MLB | 2020 | 4 |
| Games Started | MLB | 2020 | 0 |
| Games Pitched | MLB | 2020 | 12 |
| ERA | MLB | 2020 | 8.38 |
| Loss | MLB | 2020 | 0 |
| Wins | MLB | 2020 | 0 |
| Wins Above Replacement for Pitchers | MLB | 2020 | -0.3 |
|
|
| Positions Played | MLB | 2019 | 1 |
| Intentional Bases on Balls | MLB | 2019 | 0 |
| Sacrifice Flies | MLB | 2019 | 0 |
| Sacrifice Hits | MLB | 2019 | 0 |
| Times Hit by a Pitch | MLB | 2019 | 0 |
| GIDP | MLB | 2019 | 0 |
| Total Bases | MLB | 2019 | 0 |
| Strikeouts | MLB | 2019 | 0 |
| 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 | 0 |
| Hits | MLB | 2019 | 0 |
| Runs Scored | MLB | 2019 | 0 |
| At Bats | MLB | 2019 | 0 |
| Plate Appearances | MLB | 2019 | 0 |
| Games Played | MLB | 2019 | 39 |
| Wins Above Replacement for position players | MLB | 2019 | 0.0 |
|
|
| Positions Played | MLB | 2018 | 1 |
| Intentional Bases on Balls | MLB | 2018 | 0 |
| Sacrifice Flies | MLB | 2018 | 0 |
| Sacrifice Hits | MLB | 2018 | 0 |
| Times Hit by a Pitch | MLB | 2018 | 0 |
| GIDP | MLB | 2018 | 0 |
| Total Bases | MLB | 2018 | 0 |
| Strikeouts | MLB | 2018 | 0 |
| Bases on Balls/Walks | MLB | 2018 | 0 |
| Caught Stealing | MLB | 2018 | 0 |
| Stolen Bases | MLB | 2018 | 0 |
| Runs Batted In | MLB | 2018 | 0 |
| Home Runs | MLB | 2018 | 0 |
| Triples | MLB | 2018 | 0 |
| Doubles | MLB | 2018 | 0 |
| Hits | MLB | 2018 | 0 |
| Runs Scored | MLB | 2018 | 0 |
| At Bats | MLB | 2018 | 0 |
| Plate Appearances | MLB | 2018 | 0 |
| Games Played | MLB | 2018 | 29 |
| Wins Above Replacement for position players | MLB | 2018 | 0.0 |
|
|
| SO/BB | MLB | 2017 | 3.52 |
| SO9 | MLB | 2017 | 10.4 |
| BB9 | MLB | 2017 | 2.9 |
| HR9 | MLB | 2017 | 0.8 |
| H9 | MLB | 2017 | 6.5 |
| WHIP | MLB | 2017 | 1.052 |
| Fielding Independent Pitching | MLB | 2017 | 2.94 |
| ERA+ | MLB | 2017 | 175 |
| Batters Faced | MLB | 2017 | 279 |
| Wild Pitches | MLB | 2017 | 8 |
| Balks | MLB | 2017 | 0 |
| Home Runs Allowed | MLB | 2017 | 6 |
| Earned Runs Allowed | MLB | 2017 | 20 |
| Runs Allowed | MLB | 2017 | 22 |
| Hits Allowed | MLB | 2017 | 51 |
| Innings Pitched | MLB | 2017 | 70.1 |
| Saves | MLB | 2017 | 1 |
| Shutouts | MLB | 2017 | 0 |
| Complete Games | MLB | 2017 | 0 |
| Games Finished | MLB | 2017 | 6 |
| Games Started | MLB | 2017 | 0 |
| Games Pitched | MLB | 2017 | 65 |
| ERA | MLB | 2017 | 2.56 |
| Win-Loss Percentage | MLB | 2017 | 1.000 |
| Loss | MLB | 2017 | 0 |
| Wins | MLB | 2017 | 3 |
| Wins Above Replacement for Pitchers | MLB | 2017 | 2.0 |
| Positions Played | MLB | 2017 | 1 |
| Intentional Bases on Balls | MLB | 2017 | 0 |
| Sacrifice Flies | MLB | 2017 | 0 |
| Sacrifice Hits | MLB | 2017 | 0 |
| Times Hit by a Pitch | MLB | 2017 | 0 |
| GIDP | MLB | 2017 | 0 |
| Total Bases | MLB | 2017 | 0 |
| Strikeouts | MLB | 2017 | 0 |
| Bases on Balls/Walks | MLB | 2017 | 0 |
| Caught Stealing | MLB | 2017 | 0 |
| Stolen Bases | MLB | 2017 | 0 |
| Runs Batted In | MLB | 2017 | 0 |
| Home Runs | MLB | 2017 | 0 |
| Triples | MLB | 2017 | 0 |
| Doubles | MLB | 2017 | 0 |
| Hits | MLB | 2017 | 0 |
| Runs Scored | MLB | 2017 | 0 |
| At Bats | MLB | 2017 | 0 |
| Plate Appearances | MLB | 2017 | 0 |
| Games Played | MLB | 2017 | 5 |
| Wins Above Replacement for position players | MLB | 2017 | 0.0 |
|
|
| Positions Played | MLB | 2016 | 1 |
| Intentional Bases on Balls | MLB | 2016 | 0 |
| Sacrifice Flies | MLB | 2016 | 0 |
| Sacrifice Hits | MLB | 2016 | 0 |
| Times Hit by a Pitch | MLB | 2016 | 0 |
| GIDP | MLB | 2016 | 0 |
| Total Bases | MLB | 2016 | 0 |
| Strikeouts | MLB | 2016 | 0 |
| Bases on Balls/Walks | MLB | 2016 | 0 |
| Caught Stealing | MLB | 2016 | 0 |
| Stolen Bases | MLB | 2016 | 0 |
| Runs Batted In | MLB | 2016 | 0 |
| Home Runs | MLB | 2016 | 0 |
| Triples | MLB | 2016 | 0 |
| Doubles | MLB | 2016 | 0 |
| Hits | MLB | 2016 | 0 |
| Runs Scored | MLB | 2016 | 0 |
| At Bats | MLB | 2016 | 0 |
| Plate Appearances | MLB | 2016 | 0 |
| Games Played | MLB | 2016 | 22 |
| Wins Above Replacement for position players | MLB | 2016 | 0.0 |
|
|
| SO/BB | MLB | 2015 | 0.78 |
| SO9 | MLB | 2015 | 5.6 |
| BB9 | MLB | 2015 | 7.1 |
| HR9 | MLB | 2015 | 0.8 |
| H9 | MLB | 2015 | 8.7 |
| WHIP | MLB | 2015 | 1.765 |
| Fielding Independent Pitching | MLB | 2015 | 5.43 |
| ERA+ | MLB | 2015 | 62 |
| Batters Faced | MLB | 2015 | 54 |
| Wild Pitches | MLB | 2015 | 2 |
| Balks | MLB | 2015 | 0 |
| Home Runs Allowed | MLB | 2015 | 1 |
| Earned Runs Allowed | MLB | 2015 | 8 |
| Runs Allowed | MLB | 2015 | 9 |
| Hits Allowed | MLB | 2015 | 11 |
| Innings Pitched | MLB | 2015 | 11.1 |
| Saves | MLB | 2015 | 0 |
| Shutouts | MLB | 2015 | 0 |
| Complete Games | MLB | 2015 | 0 |
| Games Finished | MLB | 2015 | 5 |
| Games Started | MLB | 2015 | 0 |
| Games Pitched | MLB | 2015 | 10 |
| ERA | MLB | 2015 | 6.35 |
| Win-Loss Percentage | MLB | 2015 | .000 |
| Loss | MLB | 2015 | 4 |
| Wins | MLB | 2015 | 0 |
| Wins Above Replacement for Pitchers | MLB | 2015 | -0.4 |
| Positions Played | MLB | 2015 | 1 |
| Intentional Bases on Balls | MLB | 2015 | 0 |
| Sacrifice Flies | MLB | 2015 | 0 |
| Sacrifice Hits | MLB | 2015 | 0 |
| Times Hit by a Pitch | MLB | 2015 | 0 |
| GIDP | MLB | 2015 | 0 |
| Total Bases | MLB | 2015 | 0 |
| Strikeouts | MLB | 2015 | 0 |
| Bases on Balls/Walks | MLB | 2015 | 0 |
| Caught Stealing | MLB | 2015 | 0 |
| Stolen Bases | MLB | 2015 | 0 |
| Runs Batted In | MLB | 2015 | 0 |
| Home Runs | MLB | 2015 | 0 |
| Triples | MLB | 2015 | 0 |
| Doubles | MLB | 2015 | 0 |
| Hits | MLB | 2015 | 0 |
| Runs Scored | MLB | 2015 | 0 |
| At Bats | MLB | 2015 | 0 |
| Plate Appearances | MLB | 2015 | 0 |
| Games Played | MLB | 2015 | 1 |
| Wins Above Replacement for position players | MLB | 2015 | 0.0 |
|
|
| SO/BB | MLB | 2014 | 2.80 |
| SO9 | MLB | 2014 | 9.5 |
| BB9 | MLB | 2014 | 3.4 |
| HR9 | MLB | 2014 | 0.5 |
| H9 | MLB | 2014 | 7.1 |
| WHIP | MLB | 2014 | 1.161 |
| Fielding Independent Pitching | MLB | 2014 | 3.07 |
| ERA+ | MLB | 2014 | 168 |
| Batters Faced | MLB | 2014 | 272 |
| Wild Pitches | MLB | 2014 | 4 |
| Balks | MLB | 2014 | 0 |
| Home Runs Allowed | MLB | 2014 | 4 |
| Earned Runs Allowed | MLB | 2014 | 16 |
| Runs Allowed | MLB | 2014 | 18 |
| Hits Allowed | MLB | 2014 | 52 |
| Innings Pitched | MLB | 2014 | 66.1 |
| Saves | MLB | 2014 | 0 |
| Shutouts | MLB | 2014 | 0 |
| Complete Games | MLB | 2014 | 0 |
| Games Finished | MLB | 2014 | 3 |
| Games Started | MLB | 2014 | 0 |
| Games Pitched | MLB | 2014 | 57 |
| ERA | MLB | 2014 | 2.17 |
| Win-Loss Percentage | MLB | 2014 | .800 |
| Loss | MLB | 2014 | 2 |
| Wins | MLB | 2014 | 8 |
| Wins Above Replacement for Pitchers | MLB | 2014 | 1.4 |
| Positions Played | MLB | 2014 | 1 |
| Intentional Bases on Balls | MLB | 2014 | 0 |
| Sacrifice Flies | MLB | 2014 | 0 |
| Sacrifice Hits | MLB | 2014 | 0 |
| Times Hit by a Pitch | MLB | 2014 | 0 |
| GIDP | MLB | 2014 | 0 |
| Total Bases | MLB | 2014 | 0 |
| Strikeouts | MLB | 2014 | 0 |
| Bases on Balls/Walks | MLB | 2014 | 0 |
| Caught Stealing | MLB | 2014 | 0 |
| Stolen Bases | MLB | 2014 | 0 |
| Runs Batted In | MLB | 2014 | 0 |
| Home Runs | MLB | 2014 | 0 |
| Triples | MLB | 2014 | 0 |
| Doubles | MLB | 2014 | 0 |
| Hits | MLB | 2014 | 0 |
| Runs Scored | MLB | 2014 | 0 |
| At Bats | MLB | 2014 | 0 |
| Plate Appearances | MLB | 2014 | 0 |
| Games Played | MLB | 2014 | 4 |
| Wins Above Replacement for position players | MLB | 2014 | 0.0 |
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