Lucas Frost Giolito (born July 14, 1994) is an American professional baseball pitcher for the Boston Red Sox of Major League Baseball (MLB).
He attended Harvard-Westlake School in Studio City, California, and was selected by the Washington Nationals in the first round in the 2012 MLB draft. He made his MLB debut with the Nationals in 2016. His fastball has been clocked as high as 100 miles per hour (160 km/h).
Giolito made his MLB debut June 28, 2016, for the Washington Nationals.
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| SO/BB | MLB | 2025 | 2.16 |
| SO9 | MLB | 2025 | 7.5 |
| BB9 | MLB | 2025 | 3.5 |
| HR9 | MLB | 2025 | 1.1 |
| H9 | MLB | 2025 | 8.1 |
| WHIP | MLB | 2025 | 1.290 |
| Fielding Independent Pitching | MLB | 2025 | 4.17 |
| ERA+ | MLB | 2025 | 120 |
| Batters Faced | MLB | 2025 | 613 |
| Wild Pitches | MLB | 2025 | 4 |
| Balks | MLB | 2025 | 0 |
| Times Hit by a Pitch | MLB | 2025 | 1 |
| Strikeouts | MLB | 2025 | 121 |
| Intentional Bases on Balls | MLB | 2025 | 0 |
| Bases on Balls/Walks | MLB | 2025 | 56 |
| Home Runs Allowed | MLB | 2025 | 17 |
| Earned Runs Allowed | MLB | 2025 | 55 |
| Runs Allowed | MLB | 2025 | 62 |
| Hits Allowed | MLB | 2025 | 131 |
| Innings Pitched | MLB | 2025 | 145.0 |
| Saves | MLB | 2025 | 0 |
| Shutouts | MLB | 2025 | 0 |
| Complete Games | MLB | 2025 | 0 |
| Games Finished | MLB | 2025 | 0 |
| Games Started | MLB | 2025 | 26 |
| Games Pitched | MLB | 2025 | 26 |
| ERA | MLB | 2025 | 3.41 |
| Win-Loss Percentage | MLB | 2025 | .714 |
| Loss | MLB | 2025 | 4 |
| Wins | MLB | 2025 | 10 |
| Wins Above Replacement for Pitchers | MLB | 2025 | 2.1 |
|
|
| SO/BB | MLB | 2023 | 3.12 |
| SO9 | MLB | 2023 | 9.7 |
| BB9 | MLB | 2023 | 3.1 |
| HR9 | MLB | 2023 | 1.5 |
| H9 | MLB | 2023 | 7.9 |
| WHIP | MLB | 2023 | 1.223 |
| Fielding Independent Pitching | MLB | 2023 | 4.43 |
| ERA+ | MLB | 2023 | 117 |
| Batters Faced | MLB | 2023 | 507 |
| Wild Pitches | MLB | 2023 | 2 |
| Balks | MLB | 2023 | 0 |
| Times Hit by a Pitch | MLB | 2023 | 6 |
| Strikeouts | MLB | 2023 | 131 |
| Intentional Bases on Balls | MLB | 2023 | 0 |
| Bases on Balls/Walks | MLB | 2023 | 42 |
| Home Runs Allowed | MLB | 2023 | 20 |
| Earned Runs Allowed | MLB | 2023 | 51 |
| Runs Allowed | MLB | 2023 | 55 |
| Hits Allowed | MLB | 2023 | 106 |
| Innings Pitched | MLB | 2023 | 121.0 |
| Saves | MLB | 2023 | 0 |
| Shutouts | MLB | 2023 | 0 |
| Complete Games | MLB | 2023 | 0 |
| Games Finished | MLB | 2023 | 0 |
| Games Started | MLB | 2023 | 21 |
| Games Pitched | MLB | 2023 | 21 |
| ERA | MLB | 2023 | 3.79 |
| Win-Loss Percentage | MLB | 2023 | .500 |
| Loss | MLB | 2023 | 6 |
| Wins | MLB | 2023 | 6 |
| Wins Above Replacement for Pitchers | MLB | 2023 | 2.7 |
|
|
| SO/BB | MLB | 2022 | 2.90 |
| SO9 | MLB | 2022 | 9.9 |
| BB9 | MLB | 2022 | 3.4 |
| HR9 | MLB | 2022 | 1.3 |
| H9 | MLB | 2022 | 9.5 |
| WHIP | MLB | 2022 | 1.435 |
| Fielding Independent Pitching | MLB | 2022 | 4.06 |
| ERA+ | MLB | 2022 | 81 |
| Batters Faced | MLB | 2022 | 698 |
| Wild Pitches | MLB | 2022 | 3 |
| Balks | MLB | 2022 | 0 |
| Times Hit by a Pitch | MLB | 2022 | 4 |
| Strikeouts | MLB | 2022 | 177 |
| Intentional Bases on Balls | MLB | 2022 | 1 |
| Bases on Balls/Walks | MLB | 2022 | 61 |
| Home Runs Allowed | MLB | 2022 | 24 |
| Earned Runs Allowed | MLB | 2022 | 88 |
| Runs Allowed | MLB | 2022 | 92 |
| Hits Allowed | MLB | 2022 | 171 |
| Innings Pitched | MLB | 2022 | 161.2 |
| Saves | MLB | 2022 | 0 |
| Shutouts | MLB | 2022 | 0 |
| Complete Games | MLB | 2022 | 0 |
| Games Finished | MLB | 2022 | 0 |
| Games Started | MLB | 2022 | 30 |
| Games Pitched | MLB | 2022 | 30 |
| ERA | MLB | 2022 | 4.90 |
| Win-Loss Percentage | MLB | 2022 | .550 |
| Loss | MLB | 2022 | 9 |
| Wins | MLB | 2022 | 11 |
| Wins Above Replacement for Pitchers | MLB | 2022 | 0.4 |
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|
| SO/BB | MLB | 2021 | 3.87 |
| SO9 | MLB | 2021 | 10.1 |
| BB9 | MLB | 2021 | 2.6 |
| HR9 | MLB | 2021 | 1.4 |
| H9 | MLB | 2021 | 7.3 |
| WHIP | MLB | 2021 | 1.103 |
| Fielding Independent Pitching | MLB | 2021 | 3.79 |
| ERA+ | MLB | 2021 | 124 |
| Batters Faced | MLB | 2021 | 720 |
| Wild Pitches | MLB | 2021 | 12 |
| Balks | MLB | 2021 | 0 |
| Home Runs Allowed | MLB | 2021 | 27 |
| Earned Runs Allowed | MLB | 2021 | 70 |
| Runs Allowed | MLB | 2021 | 74 |
| Hits Allowed | MLB | 2021 | 145 |
| Innings Pitched | MLB | 2021 | 178.2 |
| Saves | MLB | 2021 | 0 |
| Shutouts | MLB | 2021 | 0 |
| Complete Games | MLB | 2021 | 1 |
| Games Finished | MLB | 2021 | 0 |
| Games Started | MLB | 2021 | 31 |
| Games Pitched | MLB | 2021 | 31 |
| ERA | MLB | 2021 | 3.53 |
| Win-Loss Percentage | MLB | 2021 | .550 |
| Loss | MLB | 2021 | 9 |
| Wins | MLB | 2021 | 11 |
| Wins Above Replacement for Pitchers | MLB | 2021 | 4.3 |
| 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 | 1 |
| Rbat+ | MLB | 2021 | 29 |
| rOBA | MLB | 2021 | .223 |
| OPS+ | MLB | 2021 | 38 |
| OPS | MLB | 2021 | .500 |
| SLG | MLB | 2021 | .250 |
| OBP | MLB | 2021 | .250 |
| Hits/At Bats | MLB | 2021 | .250 |
| Strikeouts | MLB | 2021 | 3 |
| 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 | 1 |
| Runs Scored | MLB | 2021 | 0 |
| At Bats | MLB | 2021 | 4 |
| Plate Appearances | MLB | 2021 | 4 |
| Games Played | MLB | 2021 | 2 |
| Wins Above Replacement for position players | MLB | 2021 | 0.0 |
|
|
| SO/BB | MLB | 2020 | 3.46 |
| SO9 | MLB | 2020 | 12.1 |
| BB9 | MLB | 2020 | 3.5 |
| HR9 | MLB | 2020 | 1.0 |
| H9 | MLB | 2020 | 5.8 |
| WHIP | MLB | 2020 | 1.037 |
| Fielding Independent Pitching | MLB | 2020 | 3.19 |
| ERA+ | MLB | 2020 | 128 |
| Batters Faced | MLB | 2020 | 288 |
| Wild Pitches | MLB | 2020 | 3 |
| Balks | MLB | 2020 | 0 |
| Times Hit by a Pitch | MLB | 2020 | 2 |
| Strikeouts | MLB | 2020 | 97 |
| Intentional Bases on Balls | MLB | 2020 | 0 |
| Bases on Balls/Walks | MLB | 2020 | 28 |
| Home Runs Allowed | MLB | 2020 | 8 |
| Earned Runs Allowed | MLB | 2020 | 28 |
| Runs Allowed | MLB | 2020 | 31 |
| Hits Allowed | MLB | 2020 | 47 |
| Innings Pitched | MLB | 2020 | 72.1 |
| Saves | MLB | 2020 | 0 |
| Shutouts | MLB | 2020 | 1 |
| Complete Games | MLB | 2020 | 1 |
| Games Finished | MLB | 2020 | 0 |
| Games Started | MLB | 2020 | 12 |
| Games Pitched | MLB | 2020 | 12 |
| ERA | MLB | 2020 | 3.48 |
| Win-Loss Percentage | MLB | 2020 | .571 |
| Loss | MLB | 2020 | 3 |
| Wins | MLB | 2020 | 4 |
| Wins Above Replacement for Pitchers | MLB | 2020 | 0.8 |
|
|
| SO/BB | MLB | 2019 | 4.00 |
| SO9 | MLB | 2019 | 11.6 |
| BB9 | MLB | 2019 | 2.9 |
| HR9 | MLB | 2019 | 1.2 |
| H9 | MLB | 2019 | 6.7 |
| WHIP | MLB | 2019 | 1.064 |
| Fielding Independent Pitching | MLB | 2019 | 3.43 |
| ERA+ | MLB | 2019 | 134 |
| Batters Faced | MLB | 2019 | 705 |
| Wild Pitches | MLB | 2019 | 6 |
| Balks | MLB | 2019 | 0 |
| Home Runs Allowed | MLB | 2019 | 24 |
| Earned Runs Allowed | MLB | 2019 | 67 |
| Runs Allowed | MLB | 2019 | 69 |
| Hits Allowed | MLB | 2019 | 131 |
| Innings Pitched | MLB | 2019 | 176.2 |
| Saves | MLB | 2019 | 0 |
| Shutouts | MLB | 2019 | 2 |
| Complete Games | MLB | 2019 | 3 |
| Games Finished | MLB | 2019 | 0 |
| Games Started | MLB | 2019 | 29 |
| Games Pitched | MLB | 2019 | 29 |
| ERA | MLB | 2019 | 3.41 |
| Win-Loss Percentage | MLB | 2019 | .609 |
| Loss | MLB | 2019 | 9 |
| Wins | MLB | 2019 | 14 |
| Wins Above Replacement for Pitchers | MLB | 2019 | 5.4 |
| 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 | 1 |
| Rbat+ | MLB | 2019 | 26 |
| rOBA | MLB | 2019 | .222 |
| OPS+ | MLB | 2019 | 35 |
| OPS | MLB | 2019 | .500 |
| SLG | MLB | 2019 | .250 |
| OBP | MLB | 2019 | .250 |
| Hits/At Bats | MLB | 2019 | .250 |
| Strikeouts | MLB | 2019 | 3 |
| Bases on Balls/Walks | MLB | 2019 | 0 |
| Caught Stealing | MLB | 2019 | 0 |
| Stolen Bases | MLB | 2019 | 0 |
| Runs Batted In | MLB | 2019 | 2 |
| Home Runs | MLB | 2019 | 0 |
| Triples | MLB | 2019 | 0 |
| Doubles | MLB | 2019 | 0 |
| Hits | MLB | 2019 | 1 |
| Runs Scored | MLB | 2019 | 0 |
| At Bats | MLB | 2019 | 4 |
| Plate Appearances | MLB | 2019 | 4 |
| Games Played | MLB | 2019 | 2 |
| Wins Above Replacement for position players | MLB | 2019 | 0.0 |
|
|
| SO/BB | MLB | 2018 | 1.39 |
| SO9 | MLB | 2018 | 6.5 |
| BB9 | MLB | 2018 | 4.7 |
| HR9 | MLB | 2018 | 1.4 |
| H9 | MLB | 2018 | 8.6 |
| WHIP | MLB | 2018 | 1.477 |
| Fielding Independent Pitching | MLB | 2018 | 5.56 |
| ERA+ | MLB | 2018 | 69 |
| Batters Faced | MLB | 2018 | 775 |
| Wild Pitches | MLB | 2018 | 13 |
| Balks | MLB | 2018 | 0 |
| Home Runs Allowed | MLB | 2018 | 27 |
| Earned Runs Allowed | MLB | 2018 | 118 |
| Runs Allowed | MLB | 2018 | 123 |
| Hits Allowed | MLB | 2018 | 166 |
| Innings Pitched | MLB | 2018 | 173.1 |
| Saves | MLB | 2018 | 0 |
| Shutouts | MLB | 2018 | 0 |
| Complete Games | MLB | 2018 | 0 |
| Games Finished | MLB | 2018 | 0 |
| Games Started | MLB | 2018 | 32 |
| Games Pitched | MLB | 2018 | 32 |
| ERA | MLB | 2018 | 6.13 |
| Win-Loss Percentage | MLB | 2018 | .435 |
| Loss | MLB | 2018 | 13 |
| Wins | MLB | 2018 | 10 |
| Wins Above Replacement for Pitchers | MLB | 2018 | -1.3 |
| 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 |
| Rbat+ | MLB | 2018 | -131 |
| rOBA | MLB | 2018 | .000 |
| OPS+ | MLB | 2018 | -100 |
| OPS | MLB | 2018 | .000 |
| SLG | MLB | 2018 | .000 |
| OBP | MLB | 2018 | .000 |
| Hits/At Bats | MLB | 2018 | .000 |
| Strikeouts | MLB | 2018 | 4 |
| 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 | 6 |
| Plate Appearances | MLB | 2018 | 6 |
| Games Played | MLB | 2018 | 3 |
| Wins Above Replacement for position players | MLB | 2018 | -0.1 |
|
|
| SO/BB | MLB | 2017 | 2.83 |
| SO9 | MLB | 2017 | 6.8 |
| BB9 | MLB | 2017 | 2.4 |
| HR9 | MLB | 2017 | 1.6 |
| H9 | MLB | 2017 | 6.2 |
| WHIP | MLB | 2017 | 0.949 |
| Fielding Independent Pitching | MLB | 2017 | 4.94 |
| ERA+ | MLB | 2017 | 181 |
| Batters Faced | MLB | 2017 | 179 |
| Wild Pitches | MLB | 2017 | 2 |
| Balks | MLB | 2017 | 0 |
| Times Hit by a Pitch | MLB | 2017 | 3 |
| Strikeouts | MLB | 2017 | 34 |
| Intentional Bases on Balls | MLB | 2017 | 0 |
| Bases on Balls/Walks | MLB | 2017 | 12 |
| Home Runs Allowed | MLB | 2017 | 8 |
| Earned Runs Allowed | MLB | 2017 | 12 |
| Runs Allowed | MLB | 2017 | 14 |
| Hits Allowed | MLB | 2017 | 31 |
| Innings Pitched | MLB | 2017 | 45.1 |
| Saves | MLB | 2017 | 0 |
| Shutouts | MLB | 2017 | 0 |
| Complete Games | MLB | 2017 | 0 |
| Games Finished | MLB | 2017 | 0 |
| Games Started | MLB | 2017 | 7 |
| Games Pitched | MLB | 2017 | 7 |
| ERA | MLB | 2017 | 2.38 |
| Win-Loss Percentage | MLB | 2017 | .500 |
| Loss | MLB | 2017 | 3 |
| Wins | MLB | 2017 | 3 |
| Wins Above Replacement for Pitchers | MLB | 2017 | 1.5 |
|
|
| Positions Played | MLB | 2016 | /1 |
| Intentional Bases on Balls | MLB | 2016 | 0 |
| Sacrifice Flies | MLB | 2016 | 0 |
| Sacrifice Hits | MLB | 2016 | 2 |
| Times Hit by a Pitch | MLB | 2016 | 0 |
| GIDP | MLB | 2016 | 0 |
| Total Bases | MLB | 2016 | 1 |
| Rbat+ | MLB | 2016 | -22 |
| rOBA | MLB | 2016 | .225 |
| OPS+ | MLB | 2016 | 33 |
| OPS | MLB | 2016 | .500 |
| SLG | MLB | 2016 | .250 |
| OBP | MLB | 2016 | .250 |
| Hits/At Bats | MLB | 2016 | .250 |
| Strikeouts | MLB | 2016 | 1 |
| 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 | 1 |
| Runs Scored | MLB | 2016 | 1 |
| At Bats | MLB | 2016 | 4 |
| Plate Appearances | MLB | 2016 | 6 |
| Games Played | MLB | 2016 | 6 |
| Wins Above Replacement for position players | MLB | 2016 | 0.1 |
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