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MLB Prop Bets: Miami Marlins vs St. Louis Cardinals (April 20, 2026)

The St. Louis Cardinals (13-8) face the Miami Marlins (10-12) at LoanDepot Park on Monday at 6:40pm (ET). Let's take a look at the MLB Prop Bets for the matchup. Michael McGreevy is the probable pitcher for the Cardinals, while Max Meyer is the probable pitcher for the Marlins. The Marlins are favored to win at -136, while the Cardinals are at +113. The total runs line is set at 8.5, with OVER at -102 and UNDER at -118.

  • The Cardinals (-194) have a 13-8 Run Line record this season, while the Marlins (+159) hold a record of 8-14.
  • The Cardinals have a 13-8-0 O/U record this season (meaning 13 games have gone over the total runs line and eight have gone under). The Marlins have a 14-6-2 O/U record.

Scoring Insights

  • The Cardinals are averaging 4.9 runs per game this season (T11th in the league). Comparatively, the Marlins are averaging 4.5 (13th).
  • In the field, the Cardinals are allowing a whopping 5.3 runs per game this season (27th in the league), while the Marlins are allowing an average of 4.6 runs (20th).

Let's take a look at how these teams perform in some other key statistical areas.

Batting Insights:

Batting Average

  • Looking at their batting averages this season, the Cardinals are at .233 (ranking 15th in the Major leagues), while the Marlins are batting .255 (5th).

Home Runs

  • In terms of total home runs this season, the Marlins have hit 15 (28th in the Major Leagues). Meanwhile, the Cardinals have managed 25 (T8th).

Runs Batted In

  • Finally, looking at their runs batted in, the Cardinals have recorded 101 RBIs to rank T9th in the MLB this season. Comparatively, the Marlins have recorded 95 RBIs to rank 14th.

Pitching Insights:

Earned Run Average

  • The Marlins have an earned run average of 4.06 this season (16th in the Majors), while The Cardinals have an ERA of 4.83 (26th).

Strikeouts

  • Turning our attention to total strikeouts, the Cardinals have recorded 136 this season, ranking 30th in the MLB. Meanwhile, the Marlins rank T13th for total strikeouts, recording 190.

Opponent Batting Average

  • Opponents are batting an average of only .218 against the Marlins this season (3rd in the Major Leagues). Alternatively, the Cardinals' opponents are at .255 (26th).

First Innings Moneyline

  • Here are their first innings moneyline records in 2026.
    Total Home Road Favorite Underdog Neutral Last 10
    Cardinals 4-4-13 1-2-9 3-2-4 0-2-1 4-2-12 0-0-0 2-2-6
    Marlins 5-5-12 3-1-9 2-4-3 3-1-9 2-4-3 0-0-0 3-2-5

Lead After Three Innings

  • Here are their records after the first three innings in 2026.
    Total Home Road Favorite Underdog Neutral Last 10
    Cardinals 7-6-8 4-2-6 3-4-2 1-1-1 6-5-7 0-0-0 4-2-4
    Marlins 8-9-5 6-3-4 2-6-1 6-3-4 2-6-1 0-0-0 4-4-2

NRFI/YRFI

  • The NRFI is 10-11 in Cardinals games this season. The Marlins have an 11-11 NRFI record.

Last Time They Met

The Marlins recorded a 6-2 victory over the Cardinals at LoanDepot Park when these teams last met on August 20, 2025. Max Acosta went yard en route to that victory, hitting a home run to go with an RBI.