Colin Andrew Selby Bio
Colin Andrew Selby (born October 24, 1997) is an American professional baseball pitcher for the Baltimore Orioles of Major League Baseball. Selby made his major league debut in 2023 with the Pittsburgh Pirates and has since played in MLB for the Pittsburgh Pirates, Kansas City Royals, and Baltimore Orioles.
Early Life and Background
Colin Andrew Selby was born on October 24, 1997, and is an American citizen. Public records in the supplied sources do not list a hometown or parental details, but his collegiate background is documented; Selby played college baseball at Randolph–Macon College, where he developed into a professional prospect.
After his collegiate career at Randolph–Macon College, Selby entered professional baseball through the MLB draft. The available records show Selby was selected by the Pittsburgh Pirates in the 2018 Major League Baseball draft, beginning his path through the minor leagues toward a major league role.
Path to Baseball
Selby advanced from college ball to the professional ranks when the Pittsburgh Pirates drafted him in 2018 in the 16th round, the 474th overall selection. He began his pro career in rookie ball and progressed through Single-A, High-A, Double-A, and Triple-A levels as a relief option and occasional starter early in his career.
Throughout his minor league development Selby shifted into a relief role and accumulated saves and strikeouts that drew organizational attention. The Pirates added him to their 40-man roster in November 2022, a clear indicator of the club’s valuation of him as a candidate for major league contribution.
Colin Andrew Selby Career
Early Career (2018–2022)
Selby’s first professional season came in 2018 with the rookie-level Bristol Pirates, where he made starts and posted a 4.15 ERA across 11 starts. In 2019 he advanced to Single-A Greensboro and produced a 6–3 record with a 2.97 ERA and 86 strikeouts in 88.0 innings, a strong indicator of his strikeout capability at that level.
The 2020 minor league season was canceled, and Selby returned to action in 2021 with High-A Greensboro as a bullpen arm. He appeared in 31 games out of the bullpen, compiling a 4.37 ERA with 67 strikeouts and six saves in 59 2/3 innings. In 2022 he split time mainly at Double-A Altoona, where he had a standout run with a 2.27 ERA, 43 strikeouts and eight saves in 32 2/3 innings, and he also made three appearances for Triple-A Indianapolis.
MLB Breakthrough (2023)
Following his addition to the Pittsburgh Pirates’ 40-man roster on November 15, 2022, Selby opened 2023 on the Triple-A Indianapolis Indians’ roster. He served primarily as the Indians’ closer during the early 2023 season, recording six saves and a 3.86 ERA in 28 appearances prior to a major league promotion.
Selby was promoted to the major leagues in August 2023 and made his MLB debut on August 9, 2023, against the Atlanta Braves. In that debut he worked 1 2/3 innings and struck out three batters. Over the 2023 MLB season he appeared in 21 games, registering 30 strikeouts in 24.0 innings with a 9.00 earned run average as he adjusted to major league hitters.
Kansas City Royals Era (2024)
Selby began 2024 in Triple-A Indianapolis but was designated for assignment by the Pirates on April 2 following roster moves. On April 7, 2024, he was traded to the Kansas City Royals in exchange for Connor Oliver. With Kansas City he made two appearances, posting a 6.00 ERA across three innings without recording a strikeout, and he was designated for assignment by the Royals on July 6, 2024.
Baltimore Orioles Era (2024–Present)
On July 11, 2024, the Kansas City Royals traded Selby to the Baltimore Orioles for cash considerations. He made three scoreless appearances for the Orioles following the trade, striking out five batters across four innings. The organization optioned Selby to the Triple-A Norfolk Tides to begin the 2025 season as depth for the major league bullpen.
Pitching Style and Strengths
Selby has primarily worked as a relief pitcher through his professional career, with organizations using him in late-inning and multi-inning relief roles at times. His minor league record shows an ability to generate strikeouts and to close games at the Double-A and Triple-A levels, and his major league appearances have included multi-inning relief outings and a capacity to miss bats when rolling.
Notable Events and Milestones
Key milestones in Selby’s career include being selected in the 2018 MLB draft by the Pittsburgh Pirates, being added to the Pirates’ 40-man roster in November 2022, and making his major league debut on August 9, 2023. Subsequent roster moves in 2024 led to trades from Pittsburgh to Kansas City and then to Baltimore, where he produced scoreless outings immediately after the midseason move.
Colin Andrew Selby Career Wins
Through the end of the 2025 season, Selby’s major league statistical record shows two wins and four losses with 49 strikeouts and a 6.20 earned run average. Those totals reflect his cumulative work across appearances with the Pittsburgh Pirates, Kansas City Royals, and Baltimore Orioles.
Major League Highlights
Selby’s major league debut remains a defining early highlight: his August 9, 2023 outing against the Atlanta Braves featured 1 2/3 innings pitched and three strikeouts. During the 2023 rookie campaign he collected 30 strikeouts in 24.0 innings over 21 games while gaining experience and exposure to big league competition.
Other Wins & Performances
In the minor leagues Selby posted notable seasons that supported his rise to the majors. In 2019 with Single-A Greensboro he went 6–3 with a 2.97 ERA and 86 strikeouts in 88.0 innings. In 2022 at Double-A Altoona he recorded a 2.27 ERA with 43 strikeouts and eight saves in 32 2/3 innings, performances that helped earn him protection on the 40-man roster and eventual promotion.
2025 Season Performance
Selby began the 2025 season optioned to the Triple-A Norfolk Tides as the Baltimore Orioles managed bullpen depth. He was called into 11 major league games during the 2025 regular season for Baltimore and posted an 0–2 record with a 3.21 ERA, striking out 14 batters in 14.0 innings. Those appearances demonstrated improved run prevention compared with his 2023 rookie ERA and showed the organization using him in a short-relief role.
Looking at the 2025 campaign, Selby served as a depth arm who could provide innings in the back of the bullpen and be optioned when roster needs required. His mixture of minor league closing experience and demonstrated ability to strike batters out leave him positioned as a candidate for future bullpen work, health and roster moves permitting.