Brandon Brennan
Pitcher · Career Stats, Bio & Records (2019-2021)
Brandon Brennan was a pitcher who played in Major League Baseball from 2019 to 2021 for the Seattle Mariners and the Boston Red Sox, a span of 3 seasons. Across 50 career appearances, he went 3-6 with a 4.21 ERA and 55 strikeouts. His career Pitcher PIV — Baseball Data Hub's era-adjusted measure of pitching impact — is 128.9.
- W (Wins):
- Games credited to a pitcher whose team took a lead it never surrendered while he was the pitcher of record.
- ERA (Earned Run Average):
- Earned runs allowed per nine innings pitched: (ER × 9) ÷ IP. The primary measure of pitching effectiveness.
- SO (Strikeouts):
- For a batter, times retired on a third strike; for a pitcher, batters retired on a third strike.
- WHIP (Walks and Hits per Inning Pitched):
- Baserunners allowed per inning: (BB + H) ÷ IP. Under 1.00 is elite.
Data updated
- Position
- Pitcher
- Bats / Throws
- R / R
- Height / Weight
- 6'4" / 207 lb
- MLB Debut
- 2019-03-21
- Last Game
- 2021-06-12
Full name: Brandon Sean Michael Brennan
Season-by-Season Pitching
Click a stat to plot it across every season.
| Year | Team | Lg | W | L | G | GS | CG | SHO | SV | IP | H | ER | BB | SO | ERA | Lg ERA | Pitcher PIV |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2019 | SEA | AL | 3 | 6 | 44 | 0 | 0 | 0 | 0 | 47.1 | 34 | 24 | 24 | 47 | 4.56 | 4.51 (-1%) | 128.9 |
| 2020 | SEA | AL | 0 | 0 | 5 | 0 | 0 | 0 | 0 | 7.1 | 7 | 3 | 5 | 7 | 3.68 | — | 0.0 |
| 2021 | BOS | AL | 0 | 0 | 1 | 0 | 0 | 0 | 0 | 3.0 | 3 | 0 | 2 | 1 | 0.00 | — | 0.0 |
| Career · 3 seasons | 3 | 6 | 50 | 0 | 0 | 0 | 0 | 57.2 | 44 | 27 | 31 | 55 | 4.21 | — | 129 | ||
Lg columns show the league average for that season, with the player's figure as a percentage above or below it. Career totals the seasons listed above.
Season-by-Season Batting
Click a stat to plot it across every season.
| Year | Team | Lg | G | AB | R | H | 2B | 3B | HR | RBI | SB | BB | SO | AVG | Lg AVG | Lg OBP | Lg SLG | Lg OPS | PIV |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2019 | SEA | AL | 44 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .000 | — | — | — | — | 0.0 |
| 2020 | SEA | AL | 5 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .000 | — | — | — | — | 0.0 |
| 2021 | BOS | AL | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | .000 | — | — | — | — | 0.0 |
| Career · 3 seasons | 50 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | — | — | — | — | — | 0 | ||
Lg columns show the league average for that season, with the player's figure as a percentage above or below it. Career totals the seasons listed above.
Game Log & Splits
View full game log (100 games) →Per-game data from Retrosheet (regular season, through 2025).
Batting — Home / Away
| Split | G | AB | R | H | HR | RBI | AVG |
|---|---|---|---|---|---|---|---|
| Home | 26 | 0 | 0 | 0 | 0 | 0 | — |
| Away | 24 | 0 | 0 | 0 | 0 | 0 | — |
Pitching — Home / Away
| Split | G | IP | H | ER | BB | SO | ERA |
|---|---|---|---|---|---|---|---|
| Home | 26 | 33.2 | 25 | 15 | 17 | 34 | 4.01 |
| Away | 24 | 24.0 | 19 | 12 | 14 | 21 | 4.50 |
Last 10 Games — Pitching
| Date | Tm | Opp | Dec | IP | H | R | ER | BB | SO | HR |
|---|---|---|---|---|---|---|---|---|---|---|
| 2021-06-12 | BOS | TOR | — | 3.0 | 3 | 0 | 0 | 2 | 1 | 0 |
| 2020-09-27 | SEA | OAK | — | 0.2 | 0 | 0 | 0 | 1 | 1 | 0 |
| 2020-09-22 | SEA | HOU | — | 1.1 | 2 | 1 | 1 | 1 | 2 | 1 |
| 2020-09-18 | SEA | SDP | — | 2.0 | 1 | 0 | 0 | 0 | 3 | 0 |
| 2020-09-16 | SEA | SFG | — | 2.0 | 2 | 1 | 1 | 1 | 1 | 1 |
| 2020-07-25 | SEA | HOU | — | 1.1 | 2 | 1 | 1 | 2 | 0 | 0 |
| 2019-09-27 | SEA | OAK | — | 1.0 | 0 | 0 | 0 | 2 | 1 | 0 |
| 2019-09-26 | SEA | OAK | — | 0.2 | 1 | 0 | 0 | 0 | 0 | 0 |
| 2019-09-24 | SEA | HOU | — | 0.2 | 0 | 0 | 0 | 1 | 0 | 0 |
| 2019-09-21 | SEA | BAL | — | 0.2 | 0 | 0 | 0 | 0 | 1 | 0 |
Fielding Statistics
Career Games by Position
Circle size = games played at each position.
| Position | Games |
|---|---|
| Pitcher | 50 |
Brandon Brennan: the record in brief
Between the debut on March 21, 2019 and the final game on June 12, 2021, Brandon Brennan built the record summarized on this page. The team column moves through the Seattle Mariners (2019 through 2020) and the Boston Red Sox (2021). Listed as a pitcher, Brennan batted and threw right-handed. Brennan is listed at 207 pounds on a 6-foot-4 frame. The birth record reads July 26, 1991, in Mission Viejo, CA, USA. The given name on file is Brandon Sean Michael Brennan.
The pitching table credits Brennan with a 3-6 record and a 4.21 ERA in 50 games. Brennan had 55 strikeouts. Brennan's 4.21 ERA was close to the 4.40 league figure for those seasons. In 2019, one of the busiest seasons, Brennan posted a 4.56 ERA; the league figure that year was 4.51. By Pitcher PIV, Baseball Data Hub's measure of run prevention relative to each season's league, Brennan's career adds up to 128.9.
Retrosheet box scores cover 100 of Brennan's games, and the full game log is linked from the splits section.
Brennan appears at one position only: pitcher, in 50 games. On the mound, Brennan's fielding totals are 0 putouts, 6 assists and 2 errors.
Frequently Asked Questions about Brandon Brennan
- What years did Brandon Brennan play?
- Brandon Brennan played in Major League Baseball from 2019 to 2021.
- Was Brandon Brennan a pitcher?
- Yes. Brandon Brennan pitched in the major leagues, recording 3 wins and 55 strikeouts.
- What teams did Brandon Brennan play for?
- Brandon Brennan played for 2 teams: the Seattle Mariners (2019–2020) and the Boston Red Sox (2021).
- What were Brandon Brennan's career stats?
- In 50 games, Brandon Brennan went 3-6 with a 4.21 ERA, 55 strikeouts, and 57.2 innings pitched.
- What position did Brandon Brennan play?
- Brandon Brennan played primarily as a pitcher, the position where he appeared in the most games.
- How tall was Brandon Brennan and how much did he weigh?
- Brandon Brennan was listed at 6 feet 4 inches and 207 pounds.
- What was Brandon Brennan's career ERA?
- Brandon Brennan finished with a 4.21 career ERA, going 3-6 with 55 strikeouts.
- How many strikeouts did Brandon Brennan have?
- Brandon Brennan recorded 55 career strikeouts.
- Is Brandon Brennan in the Hall of Fame?
- No. Brandon Brennan has not been inducted into the National Baseball Hall of Fame.