My Marlins vs. Padres prediction expects two clear team trends to hold at Petco Park when these teams take the field at 4:05 p.m. ET, starting with the Padres' stellar 58-28 record against sub-.500 opponents.
Conversely, a Miami Marlins squad with nothing left to play for owns a dismal 31-45 mark when facing winning teams, making this a prime spot for the Padres (56% favorite) to take care of business once again.
Find out my full game breakdown and free MLB picks for today below.
Who will win Marlins vs Padres today: Padres moneyline
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I’m on the San Diego Padres up to 58%.
Sandy Alcantara is really struggling. He's allowed at least four runs in four of his past five starts, posting a 5.52 xFIP along the way.
It’ll be tough to get back on track against the Padres. They rank sixth in hard-hit rate, fifth in xwOBA, and first in xSLG against right-handed pitching in September.
Alcantara has had a difficult time going up in class. His 3.84 ERA on the year rises to 4.97 when isolating matchups against Top-10 opponents in xwOBA.
COVERS INTEL: Sandy Alcantara is not in good form, sitting 28th among today's projected starters in SIERA over the past month.
Marlins vs Padres Over/Under pick: Over 7.5
I expect plenty of offense in this game and would play the Over to 57%.
Alcantara has posted a 1.52 WHIP over the past month while striking out just 13.5% of opposing batters. He’s allowing a ton of baserunners, and his inability to generate punchouts will be especially problematic against an offense consistently making quality contact.
The Miami Marlins quietly slot inside the Top-10 in average, wOBA, and SLG against righties this month. Meanwhile, Walker Buehler owns a middling 4.16 xFIP over the past 30 days and is unlikely to slow the Marlins entirely.
Marlins vs Padres home run prediction: Fernando Tatis Jr.
Fernando Tatis Jr. is crushing Alcantara’s pitch mix.
He has managed an impressive .333 ISO with a 20.7% barrel rate and 69.2% hard-hit rate over the last 25 games when facing Alcantara’s four most-used pitches. Those are remarkably strong power outputs.
Using the same criteria, Tatis Jr. owns a low 4.3% walk rate. He is tearing the cover off the ball and doing so aggressively. He’s not grinding out free passes.
He can’t leave the yard without putting the ball in play, and his low walk rate is a bonus.
- ML/RL picks: 119-99, -3.29 units
- Over/Under picks: 112-100-6, -1.59 units
Marlins vs Padres weather
Temperatures are expected to hover in the 70s with winds blowing left to right. Neutral impact on offense.
Marlins vs Padres odds
- Moneyline: Marlins 45% | Padres 56%
- Run line: Marlins +1.5 (64%) | Padres -1.5 (38%)
- Over/Under: Over 7.5 (55%) | Under 7.5 (46%)
Marlins vs Padres trend
The Padres have cashed the moneyline in 30 of the last 40 home games for +18.10 units and a 34% ROI. Find more MLB betting trends for Marlins vs. Padres.
How to watch Marlins vs Padres and game info
| Location | Petco Park, San Diego, CA |
| Date | Sunday, September 20, 2026 |
| First pitch | 4:10 p.m. ET |
| TV | Marlins.TV, Padres.TV |
| Marlins starting pitcher | Sandy Alcantara (13-10, 3.85 ERA) |
| Padres starting pitcher | Walker Buehler (8-6, 4.58 ERA) |
Marlins vs Padres latest injuries
Odds are correct at the time of publishing and are subject to change.
Not intended for use in MA.
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