MLB Picks Today: Predictions & Best Bets for September 18, 2026 | SharpSide

Friday presents a full 15-game MLB slate, offering numerous opportunities for sharp evaluation across the board. Our model identifies three matchups with significant divergence from market consensus: Boston Red Sox at Tampa Bay Rays, San Francisco Giants at Los Angeles Dodgers, and Milwaukee Brewers at Baltimore Orioles. The largest single run-edge of the day is a 1.7-run margin discrepancy favoring the Boston Red Sox in their series opener against the Rays, indicating a substantial disagreement with the consensus. This brief refreshes at 11:30 am Eastern based on new analytics, weather factors, pitching changes, and line movement, so featured matchups may update. Today's Best Bet is highlighted immediately below.

Today's Best Bet: Chicago Cubs ML

This is the single game and line SharpSide has the highest confidence in today. Our model projects the Chicago Cubs to defeat the Cincinnati Reds by a comfortable 1.4 runs (4.8–3.4), a full 0.5 runs stronger than the market's implied margin. While the market also favors the Cubs, our projection indicates a clearer win probability than current odds suggest. This is a conviction play, grounded in a clear model margin. Best Bet: Chicago Cubs ML (-126)

Boston Red Sox @ Tampa Bay Rays

Ranger Suarez takes the mound for the Red Sox, entering with a strong 3.08 FIP and suppressing hard contact effectively with a 0.297 xwOBA-against. For the Rays, Ian Seymour, with a 4.02 FIP and a higher 1.69 HR/9, suggests more susceptibility to runs. Suarez's consistent 5.27 IP/start offers more stability than Seymour's short 5.00 IP/start average, which will expose the Rays' bullpen earlier. The Red Sox bullpen, with a 3.10 season relief ERA, is significantly better than the league average of 4.10, and also outperforms the Rays' 4.08 ERA pen, which caused a -0.53 run nudge to the Rays' projected runs. Both offenses have been lucky on balls in play, with the model regressing the Red Sox offense down by 0.04 runs and the Rays offense down by 0.10 runs. No notable park or weather conditions are expected. The Rays enter this series opener in strong recent form, having gone 8-2 in their last 10 games, while the Red Sox are a more struggling 3-7. How the model decided: The biggest factor favoring Boston Red Sox is its 3.10 bullpen ERA, a better-than-average run-prevention mark that also tops Tampa Bay Rays's 4.08 mark. Lean: Boston Red Sox ML (+108)

San Francisco Giants @ Los Angeles Dodgers

Cesar Perdomo, making his 14.7th career MLB inning for the Giants, carries a 4.19 FIP and a 0.320 xwOBA-against this season, indicating he allows hard contact at an average-to-high rate. Facing him is Tyler Glasnow for the Dodgers, who presents a more dominant profile with a 2.93 FIP and a very low 0.274 xwOBA-against, suggesting he allows significantly weaker contact. Perdomo's average workload of 4.89 IP/start means the Giants' 4.12 ERA bullpen will be heavily exposed. The Dodgers' bullpen, despite a decent 3.99 ERA, is taxed with a 0.28 fatigue index, which added 0.31 runs to the Giants' projected score. San Francisco is missing core hitter Rafael Devers, which docked approximately 0.30 runs from their projection. The Giants have neutral BABIP luck, while the Dodgers have been lucky on balls in play, leading the model to regress their offense down by 0.08 runs. Both teams enter the series opener with decent recent form, the Giants at 5-5 and the Dodgers at 7-3. How the model decided: The biggest factor favoring San Francisco Giants is Los Angeles Dodgers's fortunate 0.295 BABIP, which produces a negative 0.08-run offensive regression for Los Angeles Dodgers. Lean: San Francisco Giants ML (+246)

Milwaukee Brewers @ Baltimore Orioles

Dustin May starts for the Milwaukee Brewers, with a 3.42 FIP and a 0.72 HR/9, indicating effective pitching and strong home run suppression. The Baltimore Orioles are yet to name a starter, but their projected starter is expected to work multiple innings. May averages 4.55 IP/start, exposing the Brewers' bullpen, which, despite a strong 3.47 ERA, is taxed with a 0.21 fatigue index. The Orioles' bullpen has a respectable 3.84 ERA and a negative fatigue index, suggesting rest, which caused a -0.30 run nudge to the Brewers' projected runs. Baltimore is missing core hitter Jackson Holliday, which docked approximately 0.18 runs off their projection. The Brewers have been lucky on balls in play with a 0.315 BABIP, leading the model to regress their offense down by 0.42 runs. Conversely, the Orioles have been unlucky with a 0.287 BABIP, pushing their offense up by 0.04 runs. Both teams have decent recent form, with the Brewers at 7-3 and the Orioles at 6-4 entering this series opener. How the model decided: The biggest factor favoring Baltimore Orioles is Milwaukee Brewers's fortunate 0.315 BABIP, which produces a negative 0.42-run offensive regression for Milwaukee Brewers. Lean: Baltimore Orioles ML (+118)

First Five Innings: Chicago Cubs @ Cincinnati Reds (F5 UNDER)

The First Five Innings total for the Chicago Cubs at Cincinnati Reds presents a notable discrepancy. Clay Holmes for the Cubs, with a blended F5-only ERA of 2.98, faces Chase Burns of the Reds, who holds a blended F5-only ERA of 2.69. Both starters project to be effective early in the game. Our model projects an F5 total of 2.72 runs, which stands in stark contrast to the market's implied F5 total of 4.42 runs. The Reds' offense has been unlucky on balls in play, leading to an upward regression of 0.15 runs, but the strong starting pitching from both sides is expected to suppress early scoring in this matchup. Lean: F5 UNDER 4.0 total

How the model decided

Today's SharpSide model divergences from the market are shaped by several key categories. The San Francisco Giants at Los Angeles Dodgers game highlights the impact of bullpen fatigue, with the taxed Dodgers pen significantly impacting their projected run allowance. In the Milwaukee Brewers at Baltimore Orioles matchup, offensive BABIP luck regression played a major role, particularly the downward adjustment for the Brewers. The Boston Red Sox at Tampa Bay Rays game also demonstrates the effect of starter quality and bullpen strength differentials. The model also considered advanced Sabermetric data, and other analytics.

How to read this

This analysis reflects our model's view of value relative to current market pricing. It is provided for informational purposes and should not be construed as financial advice.

Projections update after publish. This brief is locked in at the 11:30 am ET refresh, but the model keeps recalculating all day as lineups are posted, weather shifts, pitching changes are announced, and lines move — a side or total highlighted here can flip before first pitch. Always confirm the current number on the live projections page (which locks 30 minutes before each game's first pitch) before placing a bet.