Brandon Sean Michael Brennan
- Bats Right, Throws Right
- Height 6' 4", Weight 220 lb.
- School Orange Coast College
- High School Capistrano Valley High School
- Debut March 21, 2019
- Born July 26, 1991 in Mission Viejo, CA USA
Pitcher Brandon Brennan was picked by the Seattle Mariners from the Colorado Rockies in the 2018 Rule V Draft. The Rockies had only signed him as a minor league free agent a month earlier, after he had spent his first 7 minor league seasons in the Chicago White Sox organization. He made his debut in Japan, in the second game of a two-game season-opening series against the Oakland Athletics at the Tokyo Dome on March 21, 2019. He gave up a walk and a hit but no runs in one inning of relief. In 44 big league appearances spanning 47 1/3 innings for 2019, Brandon compiled a 4.56 ERA and 47 strikeouts.
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