Marcus Semien
SS · Born September 17, 1990
Age in each postseason series
- 2018 AL Wild Card (October 3, 2018), Athletics vs Yankees 0–1: 28 years, 16 days
- 2019 AL Wild Card (October 2, 2019), Athletics vs Rays 0–1: 29 years, 15 days
- 2020 AL Wild Card (September 29, 2020), Athletics vs White Sox 2–1: 30 years, 12 days
- 2020 ALDS (October 5, 2020), Athletics vs Astros 1–3: 30 years, 18 days
- 2023 AL Wild Card (October 3, 2023), Rangers vs Rays 2–0: 33 years, 16 days
- 2023 ALDS (October 7, 2023), Rangers vs Orioles 3–0: 33 years, 20 days
- 2023 ALCS (October 15, 2023), Rangers vs Astros 4–3: 33 years, 28 days
- 2023 World Series (October 27, 2023), Rangers vs Diamondbacks 4–1: 33 years, 40 days
Age in each season
- 2013 (White Sox): 22 years, 196 days to 23 years, 14 days
- 2014 (White Sox): 23 years, 196 days to 24 years, 14 days
- 2015 (Athletics): 24 years, 196 days to 25 years, 14 days
- 2016 (Athletics): 25 years, 197 days to 26 years, 14 days
- 2017 (Athletics): 26 years, 196 days to 27 years, 14 days
- 2018 (Athletics): 27 years, 196 days to 28 years, 14 days
- 2019 (Athletics): 28 years, 196 days to 29 years, 14 days
- 2020 (Athletics): 29 years, 197 days to 30 years, 14 days
- 2021 (Blue Jays): 30 years, 196 days to 31 years, 14 days
- 2022 (Rangers): 31 years, 196 days to 32 years, 14 days
- 2023 (Rangers): 32 years, 196 days to 33 years, 14 days
- 2024 (Rangers): 33 years, 197 days to 34 years, 14 days
- 2025 (Rangers): 34 years, 196 days to 35 years, 14 days