Joe Mantiply
34-Year-Old
Free Agent
2025 Stats
W-L
0-1
ERA
15.83
WHIP
3.00
K
8
SV
0
Rest-of-Season Projections
2025 Fantasy Outlook
Mantiply was hurt early in 2023 which played a role in a down season, but a strong September portended a bounce back in 2024. His 3.92 ERA and 41.9 hard-hit percentage last season doesn't scream success, but a 2.51 FIP indicates bad luck was at play. The lefty is consistently capable of inducing groundballs - 54.1 groundball rate in 2024 and 53.2 for his career - and limiting home runs. Entering his age-34 season, Mantiply does not overpower hitters and relies on a diet of sinkers, curveballs and changeups. If healthy, he'll earn a spot in the bullpen, where he'll work anywhere between the sixth and eighth innings while occasionally facing a difficult lefty to the final out of an inning. Read Past Outlooks
Becomes free agent
The Diamondbacks released Mantiply on Sunday.
ANALYSIS
Mantiply passed through waivers unclaimed after being removed from Arizona's 40-man roster and is now free to seek a gig in a new organization. The left-handed reliever has been torched for 17 runs on 26 hits and three walks over 9.2 innings at the big-league level in 2025.
Mantiply passed through waivers unclaimed after being removed from Arizona's 40-man roster and is now free to seek a gig in a new organization. The left-handed reliever has been torched for 17 runs on 26 hits and three walks over 9.2 innings at the big-league level in 2025.
Pitching Stats
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2025
2024
2023
2022
2021
2020
2019
Minor League Game Log
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Pitching Appearances Breakdown
Average Pitch Count
19
Last 10 Games
19
Last 5 Games
27
How many pitches does Joe Mantiply generally throw?
1-10
11-20
21-30
31-40
41-50
51-60
61-70
71-80
81-90
91-100
101-110
111-120
121+
What part of the game does Joe Mantiply generally pitch?
1st
2nd
3rd
4th
5th
6th
7th
8th
9th
Extra
% Games Reaching Innings Threshold
% Games By Number of Innings Pitched
Left/Right Pitching Splits
Since 2023
-19%
BAA vs LHP
2025
-1%
BAA vs LHP
| BAA | K | BB | H | HR | |
|---|---|---|---|---|---|
| Since 2023vs Left | .234 | 45 | 6 | 45 | 5 |
| Since 2023vs Right | .289 | 44 | 24 | 68 | 5 |
| 2025vs Left | .480 | 4 | 1 | 12 | 4 |
| 2025vs Right | .483 | 4 | 2 | 14 | 1 |
| 2024vs Left | .206 | 26 | 3 | 21 | 1 |
| 2024vs Right | .252 | 27 | 15 | 31 | 0 |
| 2023vs Left | .185 | 15 | 2 | 12 | 0 |
| 2023vs Right | .277 | 13 | 7 | 23 | 4 |
Home/Away Pitching Splits
Since 2023
-6%
ERA on Road
2025
-21%
ERA on Road
| ERA | WHIP | IP | K/9 | BB/9 | |
|---|---|---|---|---|---|
| Since 2023Home | 5.40 | 1.28 | 50.0 | 7.9 | 2.9 |
| Since 2023Away | 5.09 | 1.35 | 58.1 | 6.9 | 2.2 |
| 2025Home | 18.00 | 2.50 | 4.0 | 4.5 | 2.3 |
| 2025Away | 14.29 | 3.35 | 5.2 | 9.5 | 3.2 |
| 2024Home | 4.88 | 1.30 | 27.2 | 9.8 | 3.6 |
| 2024Away | 3.09 | 1.06 | 32.0 | 6.5 | 2.0 |
| 2023Home | 3.44 | 0.98 | 18.1 | 5.9 | 2.0 |
| 2023Away | 5.66 | 1.26 | 20.2 | 7.0 | 2.2 |
Stat Review
How does Joe Mantiply compare to other relievers?
This section compares his stats with all relief pitcher seasons from the previous three seasons (minimum 30 innings)*. The bar represents the player's percentile rank. For example, if the bar is halfway across, then the player falls into the 50th percentile for that stat and it would be considered average.
* Exit Velocity, Barrels/BBE %, Balls Hit 95+ MPH %, and Spin Rate are benchmarked against 2019 data (min 30 IP). See here for more exit velocity/barrels stats plus an explanation of current limitations with that data set.
* Exit Velocity, Barrels/BBE %, Balls Hit 95+ MPH %, and Spin Rate are benchmarked against 2019 data (min 30 IP). See here for more exit velocity/barrels stats plus an explanation of current limitations with that data set.
K/BB
2.67K/9
7.4BB/9
2.8HR/9
4.7Fastball
88.5 mphERA
15.83WHIP
3.00BABIP
.522GB/FB
1.36Left On Base
54.5%Exit Velocity
82.7 mphBarrels/BBE
8.7%Spin Rate
2073 rpmBalls Hit 95+ MPH
27.5%Swinging Strike
9.7%Advanced Pitching Stats
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Defensive Stats
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Stats Vs Today's Lineup
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Recent RotoWire Articles Featuring Joe Mantiply See More
Brad Johnson reviews NL bullpens with question marks, including in Milwaukee, where Trevor Megill was torched in a recent outing and might have a knee injury.
Much has been decided in the National League over the last few days, including the Giants' fifth starter job, which was won by Landen Roupp.
Jan Levine has a slightly smaller rundown of NL options than last week to get you prepared for the North American start to the regular season.
Todd Zola tries to remove volume from the equation when determining the value of pitchers, and finds that the market may have over-corrected on Logan Webb.
Brad Johnson is back for the 2025 season and breaks down each division starting with the NL West, where the rich just got richer, with the addition of Roki Sasaki.
Past Fantasy Outlooks
2023
2017
Mantiply made the All-Star team for the first time in 2022 after a strong first half that saw him compile a 2.21 ERA, 0.95 WHIP and 38:2 K:BB ratio over 36.2 innings. The D'Backs' lefty wasn't as good after the All-Star break (3.86 ERA, 1.29 WHIP), but he had the best walk rate among relievers for much of the season and finished 2nd in the category with a 2.5% clip. Mantiply was also adept at inducing ground balls (53.5%) and getting hitters to chase balls out of the zone, as his 42.9% O-Swing was 4th-best among relievers. The southpaw doesn't throw hard - his sinker averages just 90.4 mph - but his curve and change are effective secondary offerings. If he maintains elite command and continues improving his strikeout rate after a 3.6% jump from 2021, more save opportunities could be in the cards, as he doesn't have much competition in the Arizona pen.
More Fantasy News
DFA'd by Snakes
The Diamondbacks designated Mantiply for assignment Friday.
ANALYSIS
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Shuttled back to minors
Mantiply was optioned to Triple-A Reno on Thursday, Alex D'Agostino of SI.com reports.
ANALYSIS
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Back in Arizona
The Diamondbacks recalled Mantiply from Triple-A Reno on Saturday.
ANALYSIS
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Sent down to Reno
The Diamondbacks optioned Mantiply to Triple-A Reno on Saturday.
ANALYSIS
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ERA on rise
Mantiply allowed two runs on four hits and one walk while striking out one over one inning in Tuesday's 10-4 win over the Marlins.
ANALYSIS
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Latest Fantasy Rumors
Skidding of late
Mantiply has limped to a 4.76 ERA over his past seven appearances. The 31-year-old still carries a 2.86 season-long ERA with quality peripheral metrics.
ANALYSIS
He has begun righting the ship, but Mantiply allowing eight earned runs over his last 11 innings marked a sizably blemish. Mantiply is seemingly in the mix to earn save opportunities down the stretch. His relative youth compared to Arizona's other options bode well for his future closer status as well. Mantiply owns an excellent 0.8 BB/9 and has strong swing-and-miss stuff that has helped him enjoy a breakout year.
He has begun righting the ship, but Mantiply allowing eight earned runs over his last 11 innings marked a sizably blemish. Mantiply is seemingly in the mix to earn save opportunities down the stretch. His relative youth compared to Arizona's other options bode well for his future closer status as well. Mantiply owns an excellent 0.8 BB/9 and has strong swing-and-miss stuff that has helped him enjoy a breakout year.