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Miami Marlins vs. St. Louis Cardinals prediction, pick for MLB on Monday 4/20/26

Miami Marlins vs. St. Louis Cardinals prediction, pick for MLB on Monday 4/20/26

Published:

By: Dan Johnson

LoanDepot Park plays big, but this one doesn’t feel like a slow-burn night. St. Louis walks in 13-8 on a five-game heater after dropping 23 runs in a Houston sweep, while Miami sits 10-12 and 8-5 at home, coming off a needed win to stop a slide. Below is my preview, prediction, and pick for today’s baseball game between the Miami Marlins and the St. Louis Cardinals.

Here’s how I’ll play it. I’ll be pumping out these predictions for individual games all season, with plenty of coverage here on DraftKings Network. Follow my handle @dansby_edits for more betting plays.

Marlins vs. Cardinals prediction, preview

Max Meyer has the swing-and-miss, but not the clean innings. He enters at 4.12 ERA, 1.32 WHIP, with 20 strikeouts and nine walks in 19.2 innings, alongside a 42.4% hard-hit rate, 10.2% barrel rate, and .360 xwOBA allowed. That’s bat-missing paired with real damage risk. Michael McGreevy looks steadier on the surface at a 2.49 ERA and 0.83 WHIP in 21.2 innings, but the underlying profile is more fragile—just 12 strikeouts, a 14.9% barrel rate, .415 xwOBA, and .650 xSLG allowed. He throws strikes, but hitters are squaring him up when they connect. One arm creates volatility through walks and barrels, the other through too much quality contact in play.

The lineup math supports both sides contributing. Miami has been the better offense against right-handed pitching at .264/.331/.409 with a .740 OPS, while St. Louis sits at .223/.320/.355 with a .675 OPS in that split. But the current version of St. Louis is hotter than that season baseline, posting a .728 OPS against righties over the last two weeks and riding that five-game run with consistent scoring outputs. Miami’s recent form is quieter, but the profile still plays here—contact, baserunners, and enough gap power to pressure a low-K arm.

The player layer makes it even clearer. St. Louis brings real damage at the top—Jordan Walker at .305 with eight home runs and 16 RBI, Alec Burleson carrying a .321/.431/.528 line against right-handed pitching, and Nolan Gorman sitting at an .867 OPS in that split. Miami answers with Otto Lopez at .338/.386/.550, Liam Hicks at .328 with four home runs and 19 RBI, and a contact-driven group that doesn’t need homers to build innings. Against McGreevy’s profile, that kind of lineup can string hits together quickly.

Cardinals vs. Marlins pick, best bet

The counterargument is Meyer simply overpowering the Cardinals and collapsing one side of the total. He has 20 strikeouts in 19.2 innings, and if he gets ahead, St. Louis can run into swing-and-miss pockets. That path exists. But it requires Meyer to be efficient and clean, and his profile has not supported that yet—nine walks, a .360 xwOBA, and double-digit barrel rate all point to innings that get extended or punished. On the other side, McGreevy’s low strikeout rate means Miami is almost guaranteed contact volume, which keeps their scoring path alive regardless of how Meyer looks.

That’s why the full-game over is the right shape instead of forcing a taxed first-five angle. You’re not relying on one lineup to carry the ticket or one pitcher to collapse immediately. You’re letting both flawed profiles play out over nine innings, with Miami’s stronger split against righties and St. Louis’ hotter current form both contributing. The way it dies is Meyer finding command and turning this into a strikeout-heavy outing that suppresses one side, but the broader data still points toward sustained scoring opportunities across both halves of the game.

Over 8.5 (-110, playable to -115). Two starters with different but real flaws, two offenses with credible scoring paths, and a number that hasn’t overcorrected. Final score: Cardinals 6, Marlins 5.

Best bet: Marlins vs. Cardinals o8.5 total runs (-110)

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I am a promoter at DraftKings and am also an avid fan and user (my username is thegreatdansby9) and may sometimes play on my personal account in the games that I offer advice on. Although I have expressed my personal view on the games and strategies above, they do not necessarily reflect the view(s) of DraftKings and do not constitute a representation that any particular strategy will guarantee success. All customers should use their own skills and judgment in building lineups. I may also deploy different players and strategies than what I recommend above. I am not an employee of DraftKings and do not have access to any non-public information.