[7] The award, given to the top two-way player in America, was won by Mike McGee of Florida State University.

[8] In 2012, Johnson won the John Olerud Award as the best two-way player in college baseball.

Due to his heavy workload with Florida, the Red Sox limited Johnson's appearances for the rest of the season.

He appeared in four games for Lowell, and had his season end prematurely when a line drive broke the orbital bones in his face during the annual Futures at Fenway event.

[28] The Red Sox named Johnson their Minor League Pitcher of the Year at the end of the 2014 season, after going 13–3 with 132 strikeouts and a 2.13 ERA.

[30] Following an injury to Clay Buchholz, Johnson made his major league debut with the Red Sox on July 21, taking the loss in a 7–3 defeat to the Houston Astros.

[32] He made 19 minor league appearances (all starts), including 15 with Pawtucket, compiling a 5–7 record with 3.60 ERA in 95 innings pitched.

On May 27, Johnson threw the first shutout of the Red Sox season in a complete game against the Seattle Mariners.

[37] Overall for the 2018 Red Sox, Johnson made 38 appearances (13 starts), pitching 99+1⁄3 innings with a 4–5 record and a 4.17 ERA.

[42] He was activated to Boston's roster on June 14, but returned to the injured list late in the month with a "non-baseball related medical matter".

[44] Overall for the season with Boston, Johnson made 21 appearances (7 starts), striking out 31 in 40+1⁄3 inning with a 6.02 ERA and 1–3 record.

[48] In 14 games (10 starts) for the Triple–A Salt Lake Bees, he tallied a 3–4 record and 5.72 ERA with 47 strikeouts across 61+1⁄3 innings pitched.

Johnson, the youngest player on the 23-man roster, finished with a 1–0 record, one save, 16 strikeouts, five walks and one earned run allowed in 14+1⁄3 innings pitched.

[50] Johnson helped lead the team to a second-place finish in the 2010 International University Sports Federation World Baseball Championships.

[52] Johnson's sister, Brooke, was a four-year letterman (2006–2009) for the Florida Gators softball team.

[54] Brian's father, Billy Johnson, played college football for Florida State University in the 1970s.