Will Brennan Bio
William Daniel Brennan, known professionally as Will Brennan, is an American professional baseball outfielder who is currently a free agent. He has played in Major League Baseball (MLB) for the Cleveland Guardians and the San Francisco Giants. Brennan played college baseball for the Kansas State Wildcats before being drafted by the Cleveland Indians in 2019.
Early Life and Background
William Daniel Brennan was born on February 2, 1998, in Overland Park, Kansas, United States. He grew up in the Kansas City metropolitan area and attended Blue Valley High School, where he developed his skills as a multi-position baseball player. His upbringing in the Midwest, a region with a strong baseball tradition, helped shape his approach to the sport from an early age.
During his time at Blue Valley High School, Brennan showcased the hitting ability and athleticism that would later define his professional profile. After graduating, he chose to remain close to home and enrolled at Kansas State University, where he would spend three seasons developing his game at the collegiate level.
Path to Professional Baseball
Brennan joined the Kansas State Wildcats baseball program in 2017 and quickly established himself as one of the conference’s top young players. As a freshman, he batted .350 with 64 hits and was named second team All-Big 12 Conference, along with Freshman All-American honors from the Collegiate Baseball Newspaper and the National Collegiate Baseball Writers Association. That summer, he played collegiate summer baseball with the Anchorage Glacier Pilots of the Alaska Baseball League.
In his sophomore season, Brennan earned first team All-Big 12 recognition after batting .359 with 79 hits, 49 runs scored, and 19 stolen bases. He followed that summer by playing for the Falmouth Commodores of the Cape Cod Baseball League. As a junior in 2019, he batted .292 and also served as a pitcher, posting a 5.51 ERA across 80 innings for the Wildcats.
Following his junior year, Brennan entered the 2019 Major League Baseball draft, where the Cleveland Indians selected him in the eighth round with the 250th overall pick. He signed with the organization and was assigned to the rookie-level Arizona League Indians before earning a quick promotion to the Low-A Mahoning Valley Scrappers.
Will Brennan Career
Early Career (2019-2021)
After signing with Cleveland in 2019, Brennan moved through the Indians’ minor league system. He did not play in 2020 after the minor league season was canceled because of the COVID-19 pandemic. He returned to action in 2021 and was assigned to the High-A Lake County Captains, where he batted .290 across 62 games and earned a promotion to the Double-A Akron RubberDucks.
Brennan opened the 2022 season with Akron and continued to produce at the plate, hitting .304 with 39 runs batted in, a mark that led the Eastern League at the time of his promotion. His consistent hitting in the upper minors caught the attention of the big league club, setting the stage for his major league call-up later that year.
Cleveland Indians / Guardians Breakthrough (2022-2025)
The Cleveland Guardians selected Brennan’s contract on September 21, 2022, adding him to their active roster. He made his major league debut the same day against the Chicago White Sox. Less than two weeks later, on October 2, he hit his first major league home run and triple in the same game, both off pitcher Max Castillo. He finished his first MLB stint batting .357 with eight runs batted in and one home run across 42 at-bats, and he appeared in five postseason games for Cleveland.
Brennan’s 2023 season included several memorable moments. On May 22, he accidentally hit and killed a bird with a batted ball during a game against the Chicago White Sox, and the next day he hit a home run that he dedicated to the bird’s memory. On June 9, he recorded his first career walkoff hit in the 14th inning of a 10-9 victory over the Houston Astros. He showed positional versatility by playing all three outfield spots and finished the year with a .266/.299/.356 slash line, five home runs, 41 runs batted in, and 13 stolen bases across 138 games.
In 2024, Brennan appeared in 114 games for the Guardians, hitting .264/.309/.388 with eight home runs, 30 runs batted in, and four stolen bases. He was optioned to Triple-A Columbus to begin the 2025 season and was recalled on May 12, 2025. He went 1-for-11 with one walk across six appearances before undergoing a season-ending reconstruction of his left ulnar collateral ligament on June 9, 2025. On September 6, 2025, it was announced that he had undergone a second surgery to address a lingering groin injury. The Guardians non-tendered him on November 21, 2025, making him a free agent.
San Francisco Giants Era (2026)
On February 15, 2026, Brennan signed a one-year major league contract with the San Francisco Giants. He was optioned to the Triple-A Sacramento River Cats to open the regular season and was later recalled to the majors. Across 11 appearances with San Francisco, he went 2-for-23, and on June 10, 2026, he was designated for assignment by the club.
Notable Events and Milestones
Brennan is remembered in Cleveland for his October 2, 2022, game in which he hit his first major league home run and triple in the same contest. His walkoff hit in the 14th inning against the Houston Astros in June 2023, and the bird-dedication home run the following day, have become signature moments of his early major league career.
Will Brennan Career Wins and Statistics
Will Brennan has compiled a résumé that spans the lower minors, upper-level affiliates, and several major league seasons with two organizations. Through May 27, 2026, his major league totals stood at a .263 batting average, 14 home runs, and 79 runs batted in, with additional production on the bases and in the outfield across his time with the Cleveland Guardians and San Francisco Giants.
Will Brennan Family
Personal Life
Public details about Will Brennan’s immediate family are limited. He grew up in Overland Park, Kansas, and was active on social media, where fans followed his professional updates and postgame reflections. Brennan has largely kept his personal and family life out of the public spotlight while focusing on his baseball career.
2025 Season Performance
Brennan’s 2025 season was defined by injuries and limited major league playing time. He was optioned to Triple-A Columbus to begin the year and was recalled by the Guardians on May 12, 2025. In six appearances with Cleveland, he went 1-for-11 with one walk, and on June 9, 2025, he underwent a season-ending reconstruction of his left ulnar collateral ligament, which kept him out for the remainder of the year.
On September 6, 2025, it was announced that Brennan had undergone an additional surgery to correct a lingering groin injury. The combined effects of those procedures significantly limited his on-field contribution during the Guardians’ 2025 campaign. On November 21, 2025, Cleveland non-tendered him, allowing him to enter free agency and ultimately sign a one-year deal with the San Francisco Giants in February 2026.
