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MLB Picks, Best Bets, Props, Predictions Today – September 23

MLB Picks, Best Bets, Props, Predictions Today – September 23 article feature image
6 min read

Baseball fans are being treated to a full slate of games as the regular season winds down. Multiple games tonight have playoff implications and the betting opportunities are plentiful. Our MLB betting experts have already sifted through the latest MLB odds and made their picks and predictions, so continue reading for today's MLB best bets.

Quickslip

MLB Best Bets Today

The team logos in the table below represent each of the matchups that our MLB betting staff is targeting from today's slate of games. Click on the team logos for any of the matchups below to navigate to a specific bet discussed in this article.

GameTime (ET)Pick
Tampa Bay Rays LogoBaltimore Orioles Logo
6:35 p.m.
Detroit Tigers LogoCleveland Guardians Logo
6:40 p.m.
Miami Marlins LogoPhiladelphia Phillies Logo
6:45 p.m.
Los Angeles Dodgers LogoArizona Diamondbacks Logo
9:40 p.m.
Specific betting recommendations come from the sportsbook offering preferred odds as of writing. Always shop for the best price using our MLB Odds page, which automatically surfaces the best lines for every game.

Bet Labs' Rays vs Orioles Best Bet

Tampa Bay Rays Logo
Tuesday, September 23
6:35 p.m. ET
MLB.TV
Baltimore Orioles Logo
Under 9 (-121)
bet365 Logo

By Bet Labs

This MLB system is built on the premise that sharp money moving totals downward, paired with weak public support on the under, creates an exploitable edge in the betting market.

The strategy focuses on regular season games from 2019 to 2025 where the closing total lands between 8 and 10 — sweet spots for scoring volatility. It isolates games where the over/under line has dropped significantly from open to close, signaling smart money on the under, yet public sentiment heavily favors the over, with only a small share of bets backing the under. This mismatch between money and ticket count indicates potential value, especially when the difference between those two figures is meaningful, but not extreme. To reduce noise, the system excludes games played in extreme heat or cold, only including those where temperatures range from mild to warm. It also requires both teams to have a recent record of games that hover around the total, suggesting no extreme streaks skewing expectations. These filters ensure that neither team is riding unsustainable over or under trends. Ultimately, this system looks for low-confidence unders that have been steamed down by sharp bettors, where public interest is light and the number still sits within a realistic scoring range. The result is a consistent edge, backed by a high sample size and strong return on investment.

Overall, this system has cashed 59% of its picks (584-402-48) and generated a 14% ROI. This season, the ROI is 13% (166-114-10, 59%).

MLB Icon
Evan Abrams / Bet Labs – Steam Unders with Low OU Support
the game was played during the 2025 or 2024 or 2023 or 2022 or 2021 or 2020 or 2019 season
the visitor team's 3 Games OU Margin is between -2.3 and 5.25
the home team's 3 Games OU Margin is between -3.33 and 3.19
the temperature is between 1 and 87 degrees
the o/u change from open to close is between -1.5 and 0
the closing total is between 8 and 10
the difference between money % and ticket % is between 1 and 87
the over/under % is between 1% and 29%
betting on the Under
the game is played during the Regular season
$14,594
WON
584-402-48
RECORD
59%
WIN%

Pick: Under 9 (-121)



Tony Sartori's Tigers vs Guardians Best Bet

Detroit Tigers Logo
Tuesday, September 23
6:40 p.m. ET
MLB.TV
Cleveland Guardians Logo
Tigers -1.5 (+121)
bet365 Logo

By Tony Sartori

The Guardians possess a mere .187 expected batting average (xBA), .267 xSLG, and .220 expected weighted on-base average (xwOBA) through 145 combined plate appearances against Tarik Skubal.

With clear hitting and pitching advantages, the Tigers are the team to back in this contest.

The question is whether to take the moneyline or the run line. Considering that each of Detroit’s past 10 wins have come by at least a two-run margin, it’s worth taking a shot on the latter.

Pick: Tigers -1.5 (+121)



Sean Zerillo's Marlins vs Phillies Best Bet

Miami Marlins Logo
Tuesday, September 23
6:45 p.m. ET
MLB.TV
Philadelphia Phillies Logo
Phillies Moneyline (-215)
bet365 Logo

By Sean Zerillo

Both teams are in their superior split, but I prefer Philadelphia's offense. Over the past 30 days, the Phillies rank third against right-handed pitching with a 127 wRC+, while the Marlins are eighth against lefties (114 wRC+).

I also prefer the Phillies' bullpen. Since the Trade Deadline, Philadelphia ranks 14th in xFIP, eighth in K-BB%, eighth in Pitching+ and 15th in botERA. Meanwhile, Miami ranks 26th, 25th, 13th and 19th, respectively. Season-long defensive metrics prefer Miami (16th DRS, 7th OAA vs. 22nd, 12th for PHI), but my model makes Philadelphia the better defensive club.

I project the Phillies at -256 and would bet them to -233.

Pick: Phillies Moneyline (-215)



Bet Labs' Dodgers vs Diamondbacks Best Bet

Los Angeles Dodgers Logo
Tuesday, September 23
9:40 p.m. ET
MLB.TV
Arizona Diamondbacks Logo
Over 9 (+100)
bet365 Logo

By Bet Labs

Late in the MLB season, games played in hitter-friendly or high-variance environments — such as in Colorado, Arizona, and Washington — tend to go over the total when the closing line is modest (≤10.5). These markets often underestimate run production during the final stretch of the season due to weather conditions (e.g., dry heat in AZ/CO, humid air in DC) and expanded rosters, which increase bullpen volatility. Public perception around fatigue or playoff pressure may further depress totals.

This creates value when betting overs in August to October for these specific home teams, particularly during regular season games.

Overall, this system is 353-271-31 (57%) and has produced a 9% ROI. This season, the system has produced a 4% ROI and has cashed 55% of its picks (28-23-5).

MLB Icon
Evan Abrams – Late Season Overs, Lower Totals — COL, ARI, WAS Home (YEAR)
the game was played during the 2025 or 2024 or 2023 or 2022 or 2021 or 2018 or 2017 or 2016 or 2015 or 2014 season
the game was played in September or August or October
the closing total is between 0 and 10.5
betting on the Over
the game is played during the Regular season
the home team is Washington Nationals or Arizona Diamondbacks or Colorado Rockies
$5,817
WON
353-271-31
RECORD
57%
WIN%

Pick: Over 9 (+100)




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