Best betting promos and sportsbooks for MLB prop bets [May 20, 2026]

May 20, 2026 - 09:30

The Atlanta Braves face off against the Miami Marlins in a NL East divisional matchup on Wednesday night.

With health back on their side, the Atlanta Braves have been able to round back into World Series contending form, fielding a lineup who ranks near the top of the board in most offensive metrics.

In a NL East divisional matchup against the Miami Marlins, expect the Braves to build on their momentum by exploiting Janson Junk’s lack of command on the mound.

With fifteen games hitting the field on Wednesday, there are a wide range of prop bets and markets to groom through which you can read a detailed breakdown of them below.

Best betting promos and sportsbooks for MLB prop bets

Find the best promos and sportsbooks to use for today’s MLB prop bets.

Atlanta Braves vs Miami Marlins (6:40pm, EST)

Janson Junk Over 2.5 Earned Runs (-105) at BetMGM Sportsbook

With their stars back at full health, the Atlanta Braves have been dominant on offense, ranking in the top-10 in Hit Rate, RBIs, Runs Scored, and in On Base Percentage.

Their resurgence has helped turn the Braves into a well rounded contender while jumping out to a seven game lead for first in the NL East division standings.

Heading into Wednesday night’s contest against the Miami Marlins, expect the Braves to get off to a hot start as they battle it out against Janson Junk who is averaging an ERA of 4.14, a WHIP of 1.240, and a FIP of 4.03.

Especially with his back end struggling to give him the coverage he needs to mask his low level of play on the mound, starting a group who ranks near dead last in Fielding Percentage.

Janson Junk Under 17.5 Total Outs (-115) at BetMGM Sportsbook

With the Braves stringing together their Hits while consistently advancing their runners into scoring position, the Marlins will be quick to pull Junk to help stop the bleeding, keeping him under the total on his Outs prop.

If you want to increase your risk on the Marlins pitcher, place a wager on Junk to clear the over of 5.5 on his Hits Allowed prop as well.

Boston Red Sox vs Kansas City Royals (7:40pm, EST)

Boston Red Sox Team Total Under 3.5 (+100) at BetMGM Sportsbook

After a turbulent start to the year, the Boston Red Sox odds of winning the AL East have plummeted as they are currently 11.5 games back from the Tampa Bay Rays for first.

Their lack of production on offense has been a constant thorn in their side, kicking off their 2026 campaign ranked in the bottom ten in Contact Rate and in OPS.

Unfortunately for the Red Sox, their struggles on offense are poised to persist against the Kansas City Royals as they face off against Michael Wacha who is averaging an ERA of 2.83 and a WHIP of 0.994.

His back end will also limit the amount of variance in his start by reducing the width of the Red Sox gaps in the outfield, surrounding Wacha with a unit who ranks above league average in Defensive Efficiency.

Chicago White Sox vs Seattle Mariners (4:10pm, EST)

Emerson Hancock Over 5.5 Strikeouts (-104) at FanDuel Sportsbook

Since the start of the regular season, Emerson Hancock has been a steady source of production in the Seattle Mariners rotation, averaging an ERA of 3.02, a WHIP of 1.006, and a FIP of 3.63.

Hancock’s success on the mound stems from his aggression and pinpoint accuracy, generating less than one Hit Against and more than one Strikeout per Inning Pitched.

In a favorable matchup against the Chicago White Sox, expect Hancock to continue to create a high volume of Strikeouts by taking advantage of an offense who ranks below league average in Hit Rate and in Strikeout Rate.

For some more exposure, escalator bet Hancock’s Strikeout prop by placing smaller wagers on his alternate overs at the best available odds across multiple sportsbooks.

Andrew Benintendi Under 1.5 Total Bases (-250) at BetMGM Sportsbook

Andrew Benintendi’s sporadic play at the plate has played a major role in the White Sox inefficiencies on offense, averaging less than one Hit per game and a .679 OPS.

With Hancock creating Whiffs at a high rate, expect Benintendi to continue to struggle to barrel up the ball and be held off the bases against the Mariners pitcher.

About the author

Kody Malstrom

Kody Malstrom is a professional sports bettor and sports betting journalist with six years of experience covering a vast majority of sports. He covers football, basketball, hockey, baseball, and the UFC in written and video form.

Born and raised in Michigan, Kody is a Detroit sports fan who spends all of his Sundays in the fall rooting for the Detroit Lions and Saturdays watching as much College Football as possible. In the winter, he shifts his focus to the Detroit Red Wings and Pistons while simultaneously rooting for his North Carolina Tar Heels.

When he is not staring at betting markets, you can find Kody at the beach or snowboarding down a mountain, depending on the time of the year.

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