Arizona
Arizona Diamondbacks 2024 Player Review: Joe Mantiply
This article is part of a series chronicling the individual seasons of players who appeared for the Arizona Diamondbacks in 2024.
Reviews for players who still have rookie eligibility for 2025 will appear in our prospect season reviews. Players are presented in the reverse order of their aWAR, an average of Baseball Reference and FanGraphs WAR.
2024 Contract status: Arbitration, one year, $925,000.
The Arizona Diamondbacks’ bullpen had its moments of greatness, along with its inconsistency. But left-hander Joe Mantiply put forward one of the more consistent seasons from a D-backs reliever. He might not have put out the flashiest numbers – as he rarely does – but the former All-Star served his role admirably, and as a whole, pitched better than the box score might show.
As relief numbers can be volatile, Mantiply’s season began on a somewhat low note, giving up three hits and two runs against the Colorado Rockies. That set his ERA at a lofty 18.00 after just one appearance.
After that, he put out five scoreless showings, allowing just two hits in that span. He allowed a run in just three of his 14 April appearances, good for a 3.09 monthly ERA.
In May, he collected his first save of the season, and also made his first start of 2024, serving as a one-inning opener against the Los Angeles Dodgers, doing so in scoreless, hitless fashion..
A poor outing against the Tigers in a blowout loss on May 18 saw his ERA spike again, when he gave up three runs without recording an out. But he allowed just three hits and one run in his other 10 May appearances.
He maintained an effective middle relief pace, tending to surrender runs in the middle of months, but pitching well for the most part. He never allowed more than five earned runs in a month’s worth of action, and finished with a 3.92 ERA.
But that number is bolstered by a stellar 2.51 FIP and 3.24 xERA, meaning he was often the victim of poor batted ball luck, and rarely gave up the long ball, with a sparkling 0.15 home runs per nine, with just one homer allowed in 59.2 innings.
Those 59.2 innings nearly matched his 2022 total (60.0), and the former All-Star pitched nearly as well as he did in his 2022 campaign, despite being the only effective left-hander in Arizona’s bullpen for the majority of the season until A.J. Puk was added at the Trade Deadline.
Mantiply had to face some of the game’s best hitters, and wasn’t limited to just left-handed batters. Of course, he found some success against MLB’s top superstar in Shohei Ohtani, limiting the Japanese sensation to just one hit and three strikeouts in nine plate appearances.
Mantiply’s ability to deliver against some of the best of the best, while pitching to an overall excellent season despite some occasionally poor results, made him a valuable asset to the D-backs’ relief corp, maintaining a consistent stability in the heart of close games.
2025 Contract status: Arbitration 2
Mantiply will be arbitration-eligible again in 2025. While he is 34 years old, he’s only pitched significant innings in the majors in his last four seasons. He made $925,000 in his first year of arbitration in 2024, and will be a likely return for the D-backs in 2025.
Spotrac estimates Mantiply’s second year of arbitration will land him a deal worth $1,580,000 in 2025, and he won’t be a free agent until 2027.
With the steady, consistent nature of his play, and the premium that effective left-hand relievers are considered to be, it will be a surprise if Mantiply is not pitching significant innings for Arizona again for the 2025 season, barring injury or severe underperformance.
Believe it or not, the 2026 All-Star Game voting process has already begun, as of Wednesday. Fans who want to see their favorite members of the Arizona Diamondbacks take the field in the midsummer classic this season can begin voting for their stars.
There are certainly some deserving players on this Diamondbacks club, which is currently 32-28 and occupying the third Wild Card sport in the National League.
Here’s how and where you can vote for your hometown heroes:
How to vote for Diamondbacks players to make All-Star Game
Fans can utilize the following link to vote for members of their team on dbacks.com. Fans are permitted to fill out and submit as many as five ballots per day, selecting as many or as few players as they choose.
This period of the fan vote constitutes Phase 1 of All-Star voting, which will run from Wednesday, June 3 through Thursday, June 25 at 9:00 a.m. Arizona time (12:00 p.m. Eastern time).
Following Phase 1, the two overall top vote-getters will receive automatic berths into the All-Star lineups. If those two are not Shohei Ohtani and Aaron Judge once again, that would be an upset.
When and where is the 2026 All-Star Game?
The 2026 All-Star Game will take place at Citizens Bank Park, home of the Phillies in Philadelphia. All-Star week begins on June 10, with a full slate of activities, before the game is played on Tuesday, July 14 at 8:00 p.m. Eastern time (5:00 p.m. Arizona time).
The full schedule of events are as follows:
- Friday, July 10: HBCU Swingman Classic
- Saturday, July 11: 2026 MLB Draft
- Sunday, July 12: All-Star Sunday, MLB Futures Game, MLBx All-Star 3-on-3
- Monday, July 13: T-Mobile Home Run Derby (8:00 p.m. ET)
- Tuesday, July 14: All-Star Red Carpet, All-Star Game
Which Diamondbacks are deserving All-Stars?
| Mark J. Rebilas-Imagn Images
So, who should Diamondbacks fans vote for? Obviously, you may fill out the ballot however you choose. That can include a full roster of Diamondbacks, regardless of their stats or notoriety this season.
Still, here are some of the top performing D-backs who might have a leg up on an All-Star berth:
OF Corbin Carroll
Corbin Carroll is having another All-Star worthy season. He’s hitting .289/.380/.545 with a .925 OPS and eight home runs, while playing good right field defense. He has the eighth-most bWAR (2.7) among position players, fifth-most in the National League, and third-most among all pure outfielders.
2B Ketel Marte
If Marte wins the NL second base fan vote, it will be his third straight season starting the All-Star game. Despite such a slow start to the year, that feels possible again. Marte is hitting .259/.315/.456 with 10 homers and is playing the best defense of his career.
3B Nolan Arenado
Nolan Arenado is quietly putting together one of his better seasons of the 2020s, slashing .269/.351/.467 with eight homers and flashing his elite third base glove at nearly as good a pace as ever. His name still carries a lot of weight in third base conversations; he’ll get some votes, no matter what.
1B Ildemaro Vargas
Vargas’ bat has cooled down quite a bit since his historic start to 2026. He’s still hitting a sturdy .290/.318/.454, but feels more likely to be considered as a reserve selection than a leading vote-getter.
Honorable Mention: LHP Eduardo Rodriguez
Pitchers are not selected by the fan vote. They are selected by player ballots and the All-Star Game managers. The National League’s manager will be Dave Roberts of the Dodgers, again.
The National League has quite a few talented pitchers, but Eduardo Rodriguez currently holds the fifth-best starting pitcher ERA (2.24) among NL hurlers. It’s going to be difficult to dethrone Christopher Sanchez or Jacob Misiorowski, but Rodriguez could find his way into the pitching pool, especially after his WBC heroics for Team Venezuela.
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Arizona State has added Michael White to its coaching staff for the upcoming 2026-2027 season. White will join the program as an assistant coach and recruiting coordinator.
“I am incredibly honored to return to my home state and join this elite program,” White said. “I’m proud to say that I am coming home. I can’t thank Coach Herbie enough for the opportunity to join his incredible staff and help these young athletes grow and develop into the best individuals they can be. There are so many friends and mentors who have left their mark on this program, and I’m excited for the opportunity to leave mine and help take this program to new heights. Go Devils!”
White arrives with the Sun Devils after most recently spending the last three seasons with Alabama as an assistant. The Alabama women finished 11th at the 2026 NCAA Championships while the men were 24th.
Prior to arriving at Alabama, White spent the 2022-2023 season as a volunteer assistant at Wisconsin. He primarily coached the freestyle, breaststroke and distance groups for the Badgers. In addition to coaching the Badgers, he also was an assistant senior coach with the Madison Aquatics Club for the year. He began his coaching career at Juniata College in Pennsylvania as a volunteer assistant from 2019-2021.
White spent his collegiate career at St. Bonaventure in New York. There he was a 7x individual Atlantic-10 champion and swam to three school records as a senior with a 1:47.30 200 IM, 3:52.18 400 IM, and a 1:47.70 200 fly. He also was team captain for two season and helped the team capture the 2014 A-10 team title.
The Scottsdale, Arizona native will return to his home state. He was a 2012 AIA Division I state champion in the 100 breast and 200 IM as a senior for Dobson High School.
White joins the coaching staff led by head coach Herbie Behm, who is already known to be an innovative coach. Behm spoke of White’s innovation as well saying, “Mike is one of the best young coaches in the NCAA. His interview blew me away with the innovative ideas he presented. I can’t wait to start implementing those ideas and continue our growth at ASU.”
Arizona State swept the 2026 Big 12 team titles, and the men went on to finish 4th at 2026 NCAAs while the women were 37th. Rising senior Ilya Kharun captured the NCAA title in the 200 fly with a 1:37.66.
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