Colin Selby Bio
Colin Andrew Selby is an American professional baseball pitcher for the Baltimore Orioles of Major League Baseball (MLB). Born on October 24, 1997, he has also played in MLB for the Pittsburgh Pirates and Kansas City Royals. A right-handed reliever who came up through the college ranks, Selby made his MLB debut in 2023 with the Pirates and has continued his career in the major leagues since that point.
Early Life and Background
Colin Andrew Selby was born on October 24, 1997, and grew up in the United States, where he developed an early interest in baseball. He attended high school in his home community before continuing his education and his baseball career at Randolph–Macon College, a small private institution in Virginia known for its strong Division III athletics program. Playing college baseball there gave Selby the platform he needed to showcase his abilities on a competitive stage.
At Randolph–Macon, Selby worked as a pitcher and steadily drew attention from professional scouts for his performance on the mound. His development through the college ranks reflected a steady progression, and his time at the school prepared him for the transition into professional baseball.
Path to Baseball
Selby entered professional baseball when he was selected by the Pittsburgh Pirates in the 16th round of the 2018 Major League Baseball draft, going 474th overall. That selection marked the beginning of his climb through the minor leagues and gave him an organization to develop within. He spent his first professional season with the rookie-level Bristol Pirates, posting a 4.15 ERA across 11 starts and adjusting to the everyday schedule of pro ball.
In 2019, Selby moved up to Single-A Greensboro Grasshoppers, where he had his strongest minor league season to that point. He pitched in 17 games, registered a 6–3 record, and posted a 2.97 ERA with 86 strikeouts across 88.0 innings of work. The 2020 season, however, saw him miss game action entirely because the minor league season was canceled due to the COVID-19 pandemic.
Colin Selby Career
Early Career (2018–2021)
Selby’s early professional years were spent working his way through Pittsburgh’s farm system. After his rookie-level debut with Bristol in 2018 and a strong Single-A campaign with Greensboro in 2019, the canceled 2020 season interrupted his momentum. He returned to High-A Greensboro in 2021, making 31 appearances out of the bullpen and logging a 4.37 ERA with 67 strikeouts and 6 saves across 59 2/3 innings of work.
That bullpen role helped define his path forward. Selby showed the traits of a late-inning reliever, generating strikeouts at a steady rate while handling high-leverage situations. His progress through the lower minors gave the Pirates enough confidence to keep developing him as a potential major league option.
Minor League Breakthrough and Pirates Debut (2022–2023)
Selby spent the 2022 season with the Double-A Altoona Curve, while also appearing in three games for the Triple-A Indianapolis Indians. With Altoona, he recorded a 2.27 ERA with 43 strikeouts and 8 saves in 32 2/3 innings pitched across 26 games, the kind of production that pushed him onto the organization’s major league radar. On November 15, 2022, the Pirates added Selby to their 40-man roster to protect him from the Rule 5 draft.
He began 2023 on the Opening Day roster of the Indianapolis Indians and served as the team’s primary closer, posting a 3.86 ERA with 6 saves in 28 appearances before earning a promotion. On August 8, 2023, Selby was promoted to the major leagues for the first time, and he made his MLB debut the following day against the Atlanta Braves. In that debut, he pitched 1 2/3 innings in relief and recorded three strikeouts. Across his rookie campaign, he appeared in 21 games and finished with a 9.00 ERA and 30 strikeouts over 24.0 innings pitched.
Kansas City Royals and Baltimore Orioles Era (2024–Present)
Selby was optioned to Triple-A Indianapolis to start 2024, and on April 2, 2024, he was designated for assignment following Pittsburgh’s acquisition of Joey Bart. A few days later, on April 7, 2024, Selby was traded to the Kansas City Royals in exchange for Connor Oliver. He made two appearances for Kansas City, posting a 6.00 ERA with no strikeouts across three innings pitched, before being designated for assignment by the Royals on July 6.
On July 11, 2024, the Royals traded Selby to the Baltimore Orioles in exchange for cash considerations. He made three scoreless appearances for Baltimore, striking out five batters over four innings of work. Selby was optioned to the Triple-A Norfolk Tides to begin the 2025 season, and during that year he made 11 appearances for the Orioles, compiling an 0-2 record and a 3.21 ERA with 14 strikeouts across 14 innings pitched.
Notable Events and Milestones
Selby’s biggest career milestone came on August 9, 2023, when he made his MLB debut against the Atlanta Braves and struck out three batters in 1 2/3 innings of relief. His first win at the major league level was part of his time with the Orioles, and his 2025 season marked his most consistent stretch in the big leagues to that point. In February 2026, Selby was placed on the 60-day injured list due to right shoulder inflammation.
Colin Selby Career Wins
Colin Andrew Selby has built a career as a relief pitcher, accumulating wins across the minor leagues and Major League Baseball since 2018. Through the 2025 season, his MLB line includes a 2–4 win-loss record, a 6.20 earned run average, and 49 strikeouts, numbers that reflect a pitcher who has moved between three organizations while continuing to develop.
MLB Highlights
Selby made his MLB debut in 2023 with the Pittsburgh Pirates, and he has since added stints with the Kansas City Royals and the Baltimore Orioles. His most productive big league work came in 2025 with Baltimore, when he posted a 3.21 ERA in 11 appearances. Those results gave him a more stable role in the Orioles bullpen before his 2026 shoulder injury.
Minor League Performances
In the minors, Selby’s strongest season came in 2019 with Single-A Greensboro, where he went 6–3 with a 2.97 ERA and 86 strikeouts. He later served as a primary closer in the Pittsburgh system, including stints with Altoona and Indianapolis, and was a reliable late-inning option in the Baltimore organization as well.
Colin Selby Family
Personal Life
Colin Andrew Selby is an American professional baseball pitcher who has kept much of his personal life private. Public information about his family background, marital status, and other personal details is limited, and he is primarily known to fans and followers through his work on the mound.
2025 Season Performance
Colin Andrew Selby entered the 2025 season with the Triple-A Norfolk Tides before earning another opportunity with the Baltimore Orioles. He made 11 appearances during the regular season, compiling an 0-2 record and a 3.21 ERA with 14 strikeouts across 14 innings pitched, his most productive big league campaign to that point.
That production helped him establish a more defined role in the Baltimore bullpen as a multi-inning reliever capable of handling high-leverage situations. The season reflected growth in his command and his ability to limit damage against major league hitters. The momentum from 2025 was interrupted when, on February 14, 2026, Selby was placed on the 60-day injured list due to right shoulder inflammation, putting his next steps on hold as he works toward a return.
