2025 MLB Reliever Of The Year Award Odds and Predictions

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As the MLB season heats up, the 2025 MLB Reliever of the Year Award race is in full swing in both MLB leagues.

With dominant closers and breakout bullpen arms making headlines, bettors are already eyeing value in the odds market. In this space, I’ll break down the latest MLB odds and contenders in the AL and NL, and offer predictions for who will win the Reliever of the Year Award in 2025.

Check out more content across our MLB blog section and our full guide to the World Series odds and predictions. Don’t forget to browse our trusted sports betting sites for the best lines.

Who Won The American League Reliever Award?

Last year’s American League Reliever of the Year winner was Emmanuel Clase, the flamethrowing closer for the Cleveland Guardians. Clase – who’s now won the award twice in the last 3 seasons – put together one of the most dominant campaigns we’ve ever seen in 2024. The right-hander racked up 47 saves with a minuscule 0.61 ERA for the Cleveland Guardians.

Who Won The National League Reliever Award?

The 2024 National League Reliever of the Year went to the St. Louis Cardinals’ Ryan Helsley. Last season was one to forget for the Cardinals at large, but Helsley was a bright spot. He finished with a tidy 2.04 ERA and led the National League with 49 saves for a St. Louis team that failed to even quality for postseason play.

MLB Reliever Of The Year Odds

Check out the latest odds for the 2025 AL and NL Reliever of the Year:

There’s plenty of intrigue in both leagues. In the AL, Mason Miller’s raw stuff has made him a trendy pick despite Clase’s opening as the favorite. Edwin Diaz aims to reclaim his crown in the NL, but Helsley and Raisel Iglesias are emerging as solid value bets on their MLB teams. For expert advice and data-driven betting insights, check out the best handicappers in the industry.

AL Reliever Of The Year Odds

• Emmanuel Clase (CLE) +250
• Mason Miller (ATH) +230
• Josh Hader (HOU) +600
• Devin Williams (NYY) +550
• Andres Munoz (SEA) +800
• Jhoan Duran (MIN) +1100

Mason Miller (+230)

The flamethrowing right-hander from Oakland has been electric. Averaging over 100 mph on his fastball and showing improved command, Mason Miller has emerged as the most feared late-inning arm in the AL. If he continues this trajectory, he’s the best bet in the field.

Miller took the league by storm last season despite a middling overall campaign for the A’s. Miller posted an obscene 41.8 percent strikeout rate across 55 games for the A’s. He yielded just a .154 batting average and racked up a whopping 104 strikeouts in only 65 innings of work. Miller came up as a starter, but the team’s decision to move him to the bullpen looks wiser with each passing outing.

We’re dealing with a small sample so far in 2025 – just 4 outings and 4 innings – but Miller looks as good as ever. His K-rate is up to an incredible 57 percent in the early-going. That’s probably not sustainable…but would anybody really put it past him? There’s a decent chance the Athletics also make a playoff push this season, which would only enhance Miller’s viability in the Reliever of the Year race.

The +230 odds don’t offer a ton of upside, but I like the value here.

Emmanuel Clase (+250)

Clase has been one of the most consistent closers in baseball over the past few seasons. His cutter is lethal, and he benefits from pitching for a Guardians team built on run prevention. With experience and a proven track record, he’s a worthy frontrunner at +250.

However, we often see relievers endure plenty of ups and downs from one year to the next. Despite his incredibly dominant regular season, Clase actually struggled in the playoffs for Cleveland last year. The 27-year-old posted an ERA of 9.00 across 8 postseason innings. He allowed 8 earned runs in the playoffs after having coughed up just 5 earned runs all season.

So far this year, Clase is off to a wobbly start, too. The right-hander has already blown a save after blowing just 3 during the 2024 campaign with an ERA of 6.75 through his first 4 games. The sample is probably still too small for Cleveland to have any real concerns about Clase’s ability to remain the closer, but opposing hitters seem to have found a chink in the armor of late.

Given the odds, I’d much rather bet on the in-form Miller at +230 than the struggling Clase at +250.

Devin Williams (+550)

Devin Williams moved to the New York Yankees in an offseason trade from the Milwaukee Brewers and hasn’t skipped a beat. Williams won this award twice with the Brewers on the National League side, and he’ll attempt to become the second player in history to win it in each league. Craig Kimbrel was the other. Another win this season would also mean Williams would join Josh Hader as the only 3-time Reliever of the Year winner ever.

Williams has only pitched in 3 games for the Yankees thus far. New York’s offense has been tearing the cover off the baseball, and there simply haven’t been many save opportunities as a result. Williams converted his one and only save chance, though he should find himself in more high-leverage situations as the season proceeds.

The Yankees look every bit like a legitimate World Series contender, and this juggernaut of an offense should have little issue supplying the pitching staff with as much run support as they could possibly need. Williams’ dominance translating from the NL to the AL is far from a lock – especially given the pressures that come with playing for the league’s flagship franchise in New York – but I suspect Williams will be up to the task.

Josh Hader (+600)

Now anchoring the Houston Astros’ bullpen, Hader is back in a high-leverage role for a contender. His elite strikeout rate and postseason pedigree give him both the stats and narrative appeal voters love.

However, Hader is another once-dominant arm who may not be quite right. Hader still posted solid numbers in his first season in Houston – a 3.48 ERA with 34 saves – but that 3.80 ERA was astronomical compared to the 1.28 mark he posted in 2023 with the San Diego Padres.

Hader is now 31, so the Astros are essentially paying for prime Hader despite the possibility that he may no longer be that player. That said, his 37.8 percent strikeout rate in ’24 was actually higher than the 36.8 percent mark he posted in 2023, while his walk rate was also down by 4 percent. The hitters just managed to make better contact. After allowing a tiny 4.4 percent barrel rate in his final season in San Diego, Hader’s barrel rate exploded to 10.2 percent last year.

The hard-hit numbers are cause for concern, but Hader is off to a strong start this term. The lefty is sporting a 1.80 ERA through 4 games, and he’s converted all 3 of his save chances. If the Astros win the AL West once again thanks to a bounce-back season from Hader, he’s a phenomenal value to win this award at +600.

Who Will Win AL Reliever of the Year?

Miller is a worthy favorite, but I’d rather take a flier on the more established arms – Devin Williams or Josh Hader – at longer odds. The Yankees and Astros should be in the mix for the postseason again, and both closers should have plenty of chances to rack up saves as a result.

As of now, I think Williams at +550 is a slightly better value than Hader at +600. I’m still not fully convinced that Hader’s best days aren’t behind him, while the Yankees look like the better team than the Astros in the season’s early days.

Bet: Devin Williams (+550)

NL Reliever Of The Year Odds

• Edwin Diaz (NYM) +350
• Ryan Helsley (STL) +450
• Raisel Iglesias (ATL) +450
• Tanner Scott (LAD) +550
• Robert Suarez (SD) +700
• Ryan Walker (SF) +1100

Edwin Diaz (+350)

Back and healthy, Edwin Diaz is returning to form as one of the most dominant closers in baseball. His overpowering fastball-slider combo makes him the early front-runner in the NL.

Diaz pitched in 54 games for the New York Mets last season after missing 2023 with a torn ACL. The right-hander recorded 20 saves in 27 chances with a 3.52 ERA. He certainly wasn’t at his best, but players recovering from serious injuries generally take some time to round back into form.

So far in 2025, Diaz looks like his old self. He’s 2-for-2 in save opportunities and has yet to allow a run across 4 innings of work. His 37.5 percent strikeout rate is right around his career average, and his next walk allowed will be his first of the young campaign.

The Mets look like contenders for the NL Pennant after a big offseason, but winning a talented NL East will be no easy task. I understand why Diaz is the favorite at +350, but let’s see what else is out there.

Ryan Helsley (+450)

Helsley is quietly building a dominant career in St. Louis. His fastball velocity and high leverage usage make him a dark horse candidate who could take over this race by midseason.

It’s weird that Helsley is a dark horse considering he just won the award last season, but he doesn’t get a whole lot of hoopla compared to some of the game’s other top closers. The Cardinals have been running on the treadmill of mediocrity in recent years, but they have the potential to come out on top of what looks like a winnable NL Central.

It’s just a matter of whether the offense will be able to provide Helsley and the rest of the St. Louis staff with enough support. The right-hander has 8 strikeouts through his first 4 innings of work on the season, though he has struggled a bit with control early on. Helsley did have some high walk rates earlier in his career, but I expect him to correct the issue before long.

If the Cardinals are out of the race by the time the middle of the season rolls around, there’s certainly a chance Helsley will hit the trade block. A trade could complicate his chances to win this award, but, as of now, I like him as a value at +450 more than I do Diaz at +350.

Raisel Iglesias (+450)

Raisel Iglesias continues to be a model of consistency in Atlanta. While not flashy, his command and run suppression metrics are among the best in the league. At these odds, he offers strong value.

The Braves have gotten off to a miserable 1-8 start to the season despite entering the campaign as one of the betting favorites to represent the National League in the World Series. Atlanta has faced a tough schedule – they opened the season with 7 straight road games in San Diego and Los Angeles – but bouncing back won’t be easy, especially in what is arguably the league’s most difficult division.

Iglesias has yet to record a save, and he blew his one and only opportunity to earn one against the Dodgers. He’s posted a 4.50 ERA early in the year through just 2 outings. The Braves have been playing from behind in the vast majority of their games, and, as a result, they haven’t really had the chance to use Iglesias or their other high-leverage arms very often.

I expect the Braves to turn their season around eventually, but Iglesias’ +450 odds are a little too short for my liking.

Robert Suarez (+700)

The Padres have turned to Robert Suarez as their full-time closer, and he’s delivering. With increased strikeouts and fewer walks, his profile is trending upward quickly.

San Diego has lost plenty of talented bullpen arms in recent years, including Hader, Tanner Scott, and Luis Garcia. One of the mainstays is Suarez, however, who’s resurrected his career since joining the Padres in 2022. Suarez totaled 36 saves in 42 opportunities in his first year as the team’s closer last season.

So far this season, Suarez is a perfect 4-for-4 in ave chances. He has yet to allow an earned run in those 4 games, and he’s struck out 6 in 4 innings without even allowing a hit.

The Padres weren’t expected to take another step forward after losing more talent in the winter, but they’re off to a blazing-hot 8-2 start. Topping the Dodgers in the NL West will be no easy task, but the Pads won’t have to win the division in order for Suarez to earn this individual accolade.

Who Will Win NL Reliever of the Year?

I think the best bet of the bunch here is Robert Suarez at +700. The frontrunners in this race have legitimate question marks. Suarez is hardly a household name despite his immense success over the past few years, but I think the Padres will earn some recognition this offseason if they wind up wildly exceeding preseason expectations once again.

I don’t expect Suarez to maintain his perfect ERA or save percentage for the rest of the season, but he does have all the makings of a dominant closer. If the Padres are playing in October, I’d expect someone on this team to take home some hardware.

Bet: Robert Suarez (+700)

MLB Reliever Of The Year Winners

The following is a list of the most recent MLB Reliever of the Year award winners:

Be sure to follow updated MLB team performances and Pennant odds as we track these relievers all season long. And if you’re diving into future awards betting, keep an eye on our other MLB futures blogs here.