May 20, 2026
Athletics vs. Angels prediction: Athletics favored to win Wednesday's MLB matchup [5/20/2026]
Read Article MLB picks today: Thursday's MLB best bets include Rockies vs. Diamondbacks play [5/21/2026]
Updated: | First published:
Written by Dave Garofolo, Content Producer
Get MLB picks today and best bets for Thursday, May 21, 2026.
Today’s MLB picks for May 21, 2026 are here, with Rockies vs. Diamondbacks and Guardians vs. Tigers among the top plays identified by our model across Thursday’s MLB schedule.
Dimers’ predictive analytics engine runs 24/7, searching the latest baseball odds to unearth legitimate betting edges. The result? Data-backed picks that help Dimers Pro members make smarter decisions.
List of MLB best bets today [5/21, updated 1:34AM ET]
Below, you’ll find today’s best baseball bets, ranked by edge for Thursday, May 21, 2026.
Rockies vs. Diamondbacks over 9.5 runs (+113)
- Edge: 6.5%
- Probability: 53.5%
- Matchup: Rockies vs. Diamondbacks (9:40PM ET, Thursday)
Our model has identified value on over 9.5 runs in Rockies vs. Diamondbacks at +113 odds. A 53.5% probability produces an edge of 6.5%, making this the strongest play for today's MLB slate.
Guardians vs. Tigers over 7.5 runs (+111)
- Edge: 4.7%
- Probability: 52.2%
- Matchup: Guardians vs. Tigers (1:10PM ET, Thursday)
Guardians vs. Tigers over 7.5 runs carries a 4.7% edge and a probability of 52.2% at +111 odds, according to our model.
Athletics vs. Angels over 8.5 runs (+106)
- Edge: 4.4%
- Probability: 52.9%
- Matchup: Athletics vs. Angels (9:38PM ET, Thursday)
Athletics vs. Angels over 8.5 runs at +106 odds shows a 4.4% edge, supported by a 52.9% probability in simulations.
Pirates vs. Cardinals over 7.5 runs (-105)
- Edge: 4.1%
- Probability: 55.3%
- Matchup: Pirates vs. Cardinals (1:15PM ET, Thursday)
A 4.1% edge and 55.3% probability make Pirates vs. Cardinals over 7.5 runs at a value play in the Pirates vs. Cardinals matchup, per our model.
Mets vs. Nationals over 8.5 runs (+103)
- Edge: 4.1%
- Probability: 53.4%
- Matchup: Mets vs. Nationals (4:05PM ET, Thursday)
Mets vs. Nationals over 8.5 runs at +103 odds presents a 4.1% edge, with simulations resulting in a probability of 53.4%.
Braves vs. Marlins over 7.5 runs (-108)
- Edge: 3.6%
- Probability: 55.6%
- Matchup: Braves vs. Marlins (6:40PM ET, Thursday)
Our model finds value on over 7.5 runs in Braves vs. Marlins at -108 odds, supported by an edge of 3.6%.
Cardinals ML (+115)
- Edge: 2.7%
- Probability: 48.8%
- Matchup: Pirates vs. Cardinals (1:15PM ET, Thursday)
Our model has uncovered value on Cardinals ML at +115 odds. A 48.8% probability produces a 2.7% edge, making this a strong play for today's MLB action.
Cardinals +1.5 (-147)
- Edge: 2.3%
- Probability: 61.8%
- Matchup: Pirates vs. Cardinals (1:15PM ET, Thursday)
A 2.3% edge on a 61.8% probability makes Cardinals +1.5 at -147 odds a solid value play in today's Pirates vs. Cardinals matchup.
MLB best bets summary: Thursday, 5/21/2026
As of 1:34AM ET, here are our top MLB bets by edge recommended by our model:
| Matchup | Bet | Odds | Edge | Probability |
|---|---|---|---|---|
| Rockies vs. Diamondbacks | Over 9.5 Runs | +113 @ Kalshi | 6.5% | 53.5% |
| Guardians vs. Tigers | Over 7.5 Runs | +111 @ Polymarket | 4.7% | 52.2% |
| Athletics vs. Angels | Over 8.5 Runs | +106 @ Novig | 4.4% | 52.9% |
| Pirates vs. Cardinals | Over 7.5 Runs | -105 @ Novig | 4.1% | 55.3% |
| Mets vs. Nationals | Over 8.5 Runs | +103 @ Novig | 4.1% | 53.4% |
| Braves vs. Marlins | Over 7.5 Runs | -108 @ Polymarket | 3.6% | 55.6% |
| Pirates vs. Cardinals | Cardinals ML | +115 @ Polymarket | 2.7% | 48.8% |
| Pirates vs. Cardinals | Cardinals +1.5 | -147 @ Polymarket | 2.3% | 61.8% |
List of upcoming MLB games to bet on [5/21/2026]
- Guardians vs. Tigers (1:10PM ET, Thursday)
- Pirates vs. Cardinals (1:15PM ET, Thursday)
- Mets vs. Nationals (4:05PM ET, Thursday)
- Braves vs. Marlins (6:40PM ET, Thursday)
- Athletics vs. Angels (9:38PM ET, Thursday)
- Rockies vs. D-Backs (9:40PM ET, Thursday)
Conclusion
Our MLB best bets are locked and loaded for May 21, 2026, featuring plays such as over 9.5 runs in the Rockies vs. Diamondbacks matchup and over 7.5 runs in the Guardians vs. Tigers matchup. Powered by advanced simulations, these picks are here to boost your betting game.
Our predictions are sourced from current data to help you make informed decisions. For additional resources and advice, head to our Responsible Gambling hub.
All odds and probabilities in this article are correct and accurate at the time of publication.
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Dave Garofolo uses sophisticated AI-driven analytics to make predictions and evaluate player performances in the NBA, MLB, NFL, NHL, NCAAM, and PGA TOUR tournaments, crafting insightful game and prop previews.
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