Name is pronounced “Brian” “BAY-oh”...Hobbies include fishing, playing video games and watching anime series...As part of the 2023 Red Sox Rookie Development Program, visited patients at Boston Children’s Hospital and hosted a Play Ball clinic with the Red Sox Foundation...Attended Red Sox Winter Weekend in January 2024, signing autographs, posing for pictures with fans and taking part in panel discussions...Attended Red Sox Fenway Fest in January 2026, signing autographs, posing for pictures with fans and taking part in panel discussions.
2025
Set career bests in ERA (3.35), WHIP (1.24) and opponent AVG (.237)...Set career highs in IP (166.2) and quality starts (16)...Ranked second in the Red Sox’ rotation in games started (28), strikeouts (124), wins (11), opponent OPS (.669), quality starts and IP...Among qualified AL pitchers, posted the fourth-highest ground ball rate (49.8%)...Ranked tied ninth in the AL in quality starts...Allowed three earned runs or fewer in 26 of his 29 outings, including 21 of his final 23 games dating back to 5/23 vs. BAL...Went 3-4 with a 3.06 ERA (22 ER/64.2 IP) and .215 opponent AVG (51-for-237) in 11 road starts, compared to 8-5 with a 3.53 ERA (40 ER/102.0 IP) and .251 opponent AVG (96-for-383) in 18 G (17 GS) at Fenway Park...With RISP, held opponents to a .221 AVG (29-for-131), including a .197 AVG with RISP and 2 outs (12-for-61)...Tossed his first career nine-inning complete game on 7/8 vs. COL (9.0 IP, 2 R, BB, 10 SO)...Became the first Red Sox starter to throw a complete game since Tanner Houck’s shutout on 4/17/24 vs. CLE...On 6/15 and 8/22, became the first pitcher in Red Sox history with 7+ scoreless IP and three hits or fewer in consecutive games vs. NYY (source: Elias).
2024
Made his first Opening Day roster (began 2023 on the IL) and started the Sox’s first game of the season...Made a career-high 30 starts...Led Sox pitchers with 14 wins, tied for ninth most in the AL...Prior to Bello, the last BOS pitchers to win 14+ games in a season at the age of 25 or younger were Jon Lester (2008-09) and Roger Clemens (1986-88)...The Sox went 20-10 in his starts...Was one of only 11 pitchers to start 20+ team wins in 2024...Prior to Bello, the most recent Red Sox pitchers to start 20+ team wins in a season at the age of 25 or younger were Jon Lester (2008-09), Roger Clemens (1986-87), and Dennis Eckersley (1978)...Ranked in MLB’s 86th percentile in ground-ball rate (51.3%).
2023
Began the season on the 15-day injured list from 3/27-4/17 with right elbow inflammation...Made a rehab start with Triple-A Worcester on 4/11 vs. Columbus and allowed one run in 6.0 IP (4 H, 4 SO, HB)...In his season debut on 4/17 vs. LAA (Patriots Day), allowed five runs in 2.2 IP (8 H, BB, 5 SO, HB)...Optioned to Worcester on 4/24, but did not pitch for the WooSox before he was recalled on 4/28...Posted a 2.45 ERA (16 ER/58.2 IP) over 10 starts from 4/29-6/23...Prior to that span, the most recent Red Sox to post a sub-2.50 ERA in a 10-start span prior to turning 25 were Jon Lester, Aaron Sele, Roger Clemens and Dennis Eckersley...Won a career-high three consecutive starts from 5/4-17, allowing five ER in 16.0 IP during that span...Made three straight starts with more than 6.0 innings and only one run allowed from 6/18-29...Since the start of 2020, the only other pitchers to do so at age 24 or younger are Spencer Strider (8/12-25/2023) and Alek Manoah (8/27-9/7/2022)...Struck out eight batters in 7.0 innings on 6/18 at NYY-G2 (4 H, R, 3 BB), setting a career high that he would surpass on 9/15 at TOR (10 SO)...Took a no-hitter into the eighth inning on 6/29 vs. MIA...Allowed two hits in the eighth before exiting; one of the runners later scored (7.0 IP, 2 H, R, BB, 5 SO)...During June, posted a 2.14 ERA (8 ER/33.2 IP) in five starts...Prior to Bello, the last Red Sox under the age of 25 to allow 0 HR and post an ERA that low over a five-start span was Roger Clemens in 1986...Recorded a career-best seven consecutive quality starts from 6/5-7/14 (4-1, 2.51 ERA, 13 ER/46.2 IP)...Was the 1st Red Sox pitcher to do so prior to turning 25 since Eduardo Rodriguez in 2017 (also 7, 4/23-5/26/17)...Allowed three-plus runs in each of his first four starts after the All-Star break, from 7/14-8/1 (6.55 ERA), then allowed one or two runs in each of his next five starts from 8/7-29 (2.79 ERA)...Recorded his first career 10-strikeout game on 9/15 at TOR (6.0 IP, 4 H, 3 R, BB, 10 SO).
2022
Named Red Sox Rookie of the Year by the Boston Baseball Writers...Named Red Sox Minor League Starting Pitcher of the Year...Went 10-4 with a 2.34 ERA, 1.04 WHIP, .186 opponent AVG, and 12.09 SO/9.0 IP in 18 outings (17 starts) between Double-A Portland and Triple-A Worcester (96.0 IP, 64 H, 25 ER, 36 BB, 129 SO)...Made his MLB debut, going 2-8 with a 4.71 ERA (30 ER/57.1 IP) in 13 outings (11 starts) over two stints with BOS...Had a 3.18 ERA in his final 10 outings (16 ER/45.1 IP) after posting a 10.50 ERA in his first three (14 ER/12.0 IP)...Allowed just one HR with BOS...Began his career allowing 0 HR in his first 44.1 IP, the longest homerless streak by a Red Sox pitcher to begin their career since Rick Jones in 1976 (52.0 IP) (source: Elias)...Was the first Sox pitcher to make 11+ starts in a season at 23 or younger since Eduardo Rodriguez in 2016...Ranked in MLB’s 80th percentile in barrel percentage (5.4%, 10 of 184 batted balls).
2021
Named the Red Sox’ 2021 Minor League Starting Pitcher of the Year...Split the season between High-A Greenville (6 starts) and Double-A Portland (15 starts)...Went 7-3 with a 3.87 ERA, 1.28 WHIP, and 12.46 SO/9.0 IP (95.1 IP, 91 H, 41 ER, 31 BB, 132 SO)...Ranked T-2nd in the organization with 132 SO...Recorded 10+ SO five times, including three with Portland...Greenville went 6-0 in his starts...Threw 5.0+ innings and allowed two ER or fewer in each of those six outings...Earned the Sox’ Starting Pitcher of the Month award for May...Was 4-0 with a 2.11 ERA (5 ER/21.1 IP) in four starts for Greenville, striking out 30 batters with four BB...Promoted to Portland on 6/12...Spent the remainder of the season with the Sea Dogs...Appeared in the 2021 SiriusXM All-Star Futures Game for the AL on 7/11 at Coors Field (0.2 IP, 1 H, 1 R)...In July, recorded 28 SO and only four BB...Followed with 30 SO and seven BB in August...Made his final start on 9/16 at Hartford and earned the win (5.0 IP, 3 H, 1 R).
