|Seattle Mariners – No. 65|
|Born: July 26, 1991|
Mission Viejo, California
|March 21, 2019, for the Seattle Mariners|
|MLB statistics |
(through September 19, 2019)
|Earned run average||4.87|
Brennan attended Capistrano Valley High School in Mission Viejo, California. The Colorado Rockies selected Brennan in the 40th round of the 2010 MLB draft, but Brennan did not sign. Brennan attended the University of Oregon as a freshman in 2011, but took a redshirt and did not play for the Oregon Ducks. Brennan chose to transfer from Oregon, but as he did so too late to be eligible for a Division I school, he transferred to Orange Coast College for his 2012 sophomore season. In 15 games (14 starts) at OCC in 2012, Brennan went 11-1 with a 1.25 ERA.
The Chicago White Sox selected Brennan in the fourth round, with the 141st overall selection, of the 2012 MLB draft. Brennan signed with the White Sox for a $320,800 signing bonus. After signing, he debuted with the Great Falls Voyagers of the Rookie-level Pioneer League, pitching to a 3–2 win-loss record with a 4.34 earned run average (ERA) in 37 innings pitched. In 2013, he pitched for the Kannapolis Intimidators of the Class A South Atlantic League, going 4–9 with a 5.53 ERA in 81 innings. Brennan spent 2014 with Great Falls, Kannapolis, and the Winston-Salem Dash of the Class A-Advanced Carolina League. He combined to go 5–1 with a 2.91 ERA in 66 innings. He spent 2015 with Winston-Salem, going 3–4 with a 3.55 ERA in 58 innings. The Chicago White Sox added Brennan to their 40-man roster after the 2015 season.
Brennan spent 2016 with Winston-Salem and the Birmingham Barons of the Double-A Southern League, going a combined 3–12 with a 6.79 ERA in 102 innings. He spent the 2017 season with Birmingham and the Charlotte Knights of the Triple-A International League, going a combined 2–2 with a 4.68 ERA in 59 2⁄3 innings. In 2018, he again split the season between Birmingham and Charlotte, combining to go 5–4 with a 3.25 ERA in 74 2⁄3 innings.
The Seattle Mariners identified Brennan as a player to target when their analytics department identified improvements in Brennan's changeup. At the Winter Meetings in December 2018, they selected Brennan with the 13th pick in the Rule 5 draft. Brennan made the Seattle Mariners's 2019 Opening Day roster. Brennan made his major league debut on March 21, 2019, pitching a scoreless eighth inning.
- "Mariners Rule 5 draftee Brandon Brennan pitching well | Tacoma News Tribune". Thenewstribune.com. Retrieved April 21, 2019.
- "Mariners select RHP Brandon Brennan in Rule 5 Draft, lose three players in minor-league portion". lookoutlanding.com. December 13, 2018. Retrieved March 20, 2019.
- "Brandon Brennan". thebaseballcube.com. Retrieved March 20, 2019.
- "White Sox add Brandon Brennan to 40-man roster". MLB.com. Retrieved December 14, 2018.
- "Colorado Rockies assign Brandon Brennan to Triple-A Albuquerque". roxpile.com. November 20, 2018. Retrieved March 20, 2019.
- Johns, Greg (April 10, 2019). "Rule 5 pick Brandon Brennan enjoys success | Seattle Mariners". Mlb.com. Retrieved April 21, 2019.
- "How technology ID'd Brandon Brennan's secret weapon — and added it to the Mariners' bullpen – The Athletic". Theathletic.com. Retrieved April 21, 2019.
- "2018 Rule 5 Draft Results". MLB Trade Rumors. Retrieved December 14, 2018.
- "Mariners set 25-man Opening Day roster". mlb.com. March 19, 2019. Retrieved March 20, 2019.
- "Mariners Box Score 3/21/2019". mlb.com. March 21, 2019. Retrieved March 21, 2019.