Amidst a rebuild, the Arizona Diamondbacks are finally seeing the fruits of their labor. Led by promising starters Zac Gallen, 2.54 ERA in 184 innings, and Merrill Kelly, 3.37 ERA in 200 1/3 innings, and backed offensively by a quartet of promising young outfield talent, Alek Thomas, Daulton Varsho, Jake McCarthy, and Corbin Carroll, the D-Backs are quickly re-entering a competitive window.
However, the Diamondbacks’ bullpen is still falling flat. After signing Mark Melancon to a 2-year, $12MM contract ($5MM mutual option for the 2024 season, $2MM buyout) and Ian Kennedy to a 1-year, $4.5MM contract ($4MM club option for the 2023 season, $250K buyout), the D-Backs’ pen posted the sixth-highest ERA (4.58), the eighth-most blown saves (27), the lowest strikeout rate (19.7%), and allowed the third-highest batting average (.254). Veterans Melancon and Kennedy did not fare much better. Melancon pitched to a 4.66 ERA in 56 innings with a paltry 14.2% strikeout rate and a career-worst 43.2% ground ball rate, while Kennedy pitched to a 5.36 ERA in 50 1/3 innings with a weak 19.0% strikeout rate and an extremely low 24.4% groundball rate.
However, the breakout of lefty journeyman Joe Mantiply was a bright spot among an otherwise weak bullpen performance. Mantiply, a former 27th-round pick from Virginia Tech by the Tigers in 2013, reached the majors for a quick stint in 2016, before shuffling around various minor league teams and undergoing Tommy John surgery in 2018. He signed a minor league deal with Arizona in 2020, making another short appearance in 2020 before eventually joining the team in a more long-term fashion during the 2021 season, in which he pitched 39 2/3 innings to a 3.40 ERA with opponents hitting a strong .292/.358/.448 against him.
In the 2022 season Mantiply, who is controllable through the 2026 season, improved his 2021 numbers. Pitching to a low 2.85 ERA in 60 innings with a solid 25.1% strikeout rate, a sparkling 2.5% walk rate, and missing hitters’ barrels (99th percentile for Chase Rate, 94th percentile for Barrel %), the 31-year-old earned a trip to the All-Star game in his second full season. Left-handed hitters have found limited success against Mantiply, slashing a poor .247/.297/.282 against him, while righties are hitting a slightly better .260/.272/.404. The unsightly .252 combined average may be cause for concern, however, Mantiply is tied for the 27th lowest Hard Hit%, among relievers to pitch 50+ innings, and is in the 89th percentile for Average Exit Velocity.
The Diamondbacks will likely look to address their bullpen again this offseason, but with a high-leverage lefty reliever in Mantiply, they will have one less bullpen spot to fill.

In the team’s official press release, Bochy said he is “incredibly excited to be joining the Texas Rangers. Over the last several days, I’ve had extensive conversations with Chris Young and other individuals in the organization, and I had the chance to meet with [co-owner] Ray Davis. Their vision and commitment to putting together a club that can contend and win year in and year out is impressive, and I became convinced I wanted to be a part of that. If I was going to return to managing, it had to be the right situation. I strongly believe that to be the case with the Rangers, and I can’t wait to get started.”