Joan Adon is a Dominican right-hander born August 12, 1998, in Santo Domingo who made his MLB debut on October 3, 2021, with the Washington Nationals. His path to the big leagues hasn’t been easy — a combined ERA north of 6.70 over three seasons tells that story clearly — but Adon keeps grinding, most recently in Dominican winter ball with the Águilas Cibaeñas.
Quick Facts
- Full name: Joan Adon
- Position: Pitcher
- Current team: Águilas Cibaeñas (LIDOM)
- Number: 60
- Bats / Throws: Right / Right
- Height / Weight: 6’2″ / 247 lb
- Born: August 12, 1998 (age 26), Santo Domingo, Dominican Republic 🇩🇴
- MLB debut: October 3, 2021
Background
Adon came up through the Dominican baseball pipeline before signing with the Washington organization, which eventually gave him his shot at the highest level. He stepped onto an MLB mound for the first time on October 3, 2021, and became part of Washington’s plans for the future.
Professional Career
His first full big-league season in 2022 was a trial by fire: 64.2 innings, a 1-12 record, 55 strikeouts, a 7.10 ERA, and a 1.78 WHIP. The raw stuff was there; the consistency wasn’t.
2023 showed a small step forward — 2-4 with 48 strikeouts and a 6.45 ERA across 51.2 innings. Then 2024 was mostly lost: just 10.2 innings pitched, 6 strikeouts, and a 6.75 ERA. The big-league numbers across all three seasons make one thing clear: Adon is still searching for the formula that sticks at this level.
MLB Stats
- 2022 — Washington Nationals: 64.2 IP | 1-12 | 55 K | 7.10 ERA | 1.78 WHIP
- 2023 — Washington Nationals: 51.2 IP | 2-4 | 48 K | 6.45 ERA | 1.63 WHIP
- 2024 — Washington Nationals: 10.2 IP | 0-0 | 6 K | 6.75 ERA | 1.50 WHIP
Winter Ball with Águilas Cibaeñas
Away from the pressure of the majors, Adon has been a regular with Águilas Cibaeñas in LIDOM. In the 2026-27 season he appeared in 4 games, going 1-2 with an ERA of 4.50 and 18 strikeouts in 16.0 innings. His best winter showing came in 2022-23: a 3.86 ERA across 18.2 innings — proof that when the environment fits, he can be genuinely effective.
LIDOM Stats
- 2026-27 — Águilas Cibaeñas: 4 G | 16.0 IP | 1-2 | 18 K | 4.50 ERA
- 2022-23 — Águilas Cibaeñas: 5 G | 18.2 IP | 0-1 | 15 K | 3.86 ERA
- 2021-22 — Águilas Cibaeñas: 4 G | 8.0 IP | 0-0 | 7 K | 7.88 ERA
Worth Noting
The gap between Adon’s winter numbers and his MLB numbers is striking. A 3.86 ERA in LIDOM versus a 7.10 in the big leagues during the same calendar year isn’t just a footnote — it’s the central question of his career. Can he bring that version of himself to Washington? Winter ball is where he’s working on the answer.
