Luis Jefferso Curvelo Bio
Luis Jefferso Curvelo is a Venezuelan professional baseball pitcher who currently plays for the Texas Rangers of Major League Baseball (MLB). Born on October 21, 2000, Curvelo signed his first professional contract with the Seattle Mariners as an international free agent in May 2018. After spending seven seasons developing within the Mariners minor league system, he joined the Rangers organization in November 2024. Curvelo made his MLB debut with Texas in July 2025 and appeared in 17 games during his rookie campaign, recording his first career win against his former organization.
Early Life and Background
Luis Jefferso Curvelo was born in Venezuela on October 21, 2000. As a young athlete growing up in Venezuela, Curvelo developed his passion and skills for baseball, particularly as a pitcher. His upbringing in the baseball-rich culture of Venezuela provided him with the foundation and motivation to pursue a professional career in the sport.
Curvelo’s dedication to baseball led him to pursue opportunities beyond Venezuela. His talent caught the attention of professional scouts, ultimately resulting in his signing with a Major League Baseball organization at a young age.
Path to Professional Baseball
On May 22, 2018, Curvelo signed with the Seattle Mariners organization as an international free agent. This signing marked his entry into professional baseball and the beginning of his journey through the minor leagues. He made his professional debut with the Dominican Summer League Mariners, where he started his development as a pitcher in a professional environment.
The following year, in 2019, Curvelo advanced his career by splitting time between the rookie-level Arizona League Mariners and the Low-A Everett AquaSox. During this split season, he accumulated a combined record of 2-2 with a 4.82 earned run average and 37 strikeouts across 16 appearances. This period allowed him to adapt to the higher level of competition and refine his pitching mechanics.
The 2020 season presented an unexpected challenge when the COVID-19 pandemic led to the cancellation of the minor league season. Curvelo did not appear in any games that year, forcing him to wait for his next opportunity to continue his development.
Luis Jefferso Curvelo Career
Seattle Mariners Organization (2018–2024)
Curvelo returned to action in 2021 with the Single-A Modesto Nuts. He emerged as a reliable relief pitcher, making 37 appearances out of the bullpen. He compiled an impressive 5-1 record with a 3.58 earned run average, registering 80 strikeouts and converting 6 saves across 55 and one-third innings pitched. This season represented a significant breakthrough in his development, demonstrating his ability to perform consistently at a higher level.
In 2022, Curvelo advanced to High-A Everett, where he made 37 relief appearances. He posted a 3-2 record with a 4.82 earned run average and recorded 57 strikeouts over 52 and one-third innings. While his earned run average increased slightly from the previous season, he continued to gain valuable experience facing more skilled hitters at the advanced minor league level.
Curvelo returned to Everett for the 2023 season, making 41 relief outings. He logged a 3-1 record with a 3.78 earned run average and 60 strikeouts across 52 and one-third innings. His ability to maintain sub-4.00 earned run averages at the High-A level showcased his development as a reliable late-inning reliever.
The 2024 season proved to be his strongest minor league campaign. Curvelo spent the year with the Double-A Arkansas Travelers, compiling a 4-0 record and an impressive 2.57 earned run average. He recorded 78 strikeouts and converted 3 saves across 66 and two-thirds innings pitched. This exceptional performance demonstrated his readiness for Triple-A competition and positioned him for a potential major league opportunity. Following the season, Curvelo elected free agency on November 4, 2024.
Texas Rangers Era (2024–Present)
On November 13, 2024, Curvelo signed a major league contract with the Texas Rangers, joining their organization for the 2025 season. The Rangers assigned him to the Triple-A Round Rock Express to begin the year, where he continued to refine his craft at the highest level of the minor leagues. With Round Rock, he logged a 3-3 record with a 3.26 earned run average, recording 40 strikeouts and converting 2 saves across 34 appearances.
On July 30, 2025, Curvelo received the call to the major leagues for the first time in his career, promoted to the Texas Rangers roster. This milestone represented the culmination of seven years of development within professional baseball. He made his MLB debut later that month, taking the mound for his hometown team in a major league game for the first time.
Notable Events and Milestones
On August 2, 2025, Curvelo recorded his first career major league win in dramatic fashion. He pitched one and one-third scoreless innings of relief against his former organization, the Seattle Mariners, helping the Rangers secure the victory. This moment held special significance as he defeated the team that originally signed and developed him throughout his professional career. Curvelo finished his rookie season with Texas making 17 appearances, compiling a 1-1 record with a 5.68 earned run average and 20 strikeouts over 19 innings of work.
Luis Jefferso Curvelo Career Wins
Curvelo has built a solid track record throughout his professional career, primarily as a relief pitcher. His minor league career spans eight seasons, during which he has demonstrated consistent performance across multiple levels of competition.
MLB Highlights
Curvelo made his MLB debut in 2025 with the Texas Rangers. During his rookie season, he appeared in 17 games and earned his first career win on August 2 against the Seattle Mariners. Through June 7, 2026, his major league statistics include a 1-1 win-loss record, a 5.47 earned run average, and 24 strikeouts across 24 appearances.
Minor League Career Highlights
Throughout his seven seasons in the Seattle Mariners system, Curvelo accumulated numerous wins across various levels. His most productive minor league season came in 2024 with Double-A Arkansas, where he went 4-0 with a 2.57 earned run average and 78 strikeouts. He also excelled in 2021 with Single-A Modesto, posting a 5-1 record with 6 saves and 80 strikeouts. Curvelo consistently performed as a high-leverage reliever throughout his minor league tenure.
2025 Season Performance
The 2025 season marked Curvelo’s transition from minor league contributor to major league pitcher. After opening the year with Triple-A Round Rock, he earned his promotion to Texas in late July. His debut season with the Rangers featured 17 relief appearances, during which he logged 19 innings and recorded his first career win against the Mariners. The season statistics through early June 2026 showed continued MLB experience with a 1-1 record, a 5.47 earned run average, and 24 strikeouts. Beginning the 2026 season with Triple-A Round Rock, Curvelo continued his development while remaining on the Rangers roster radar for future major league opportunities.