MLB Picks Today: Predictions & Best Bets for September 3, 2026 | SharpSide

A 9-game slate awaits on this Thursday, with several matchups presenting key analytical differences between the SharpSide model and market consensus. The Boston Red Sox and Baltimore Orioles square off, while the Miami Marlins face the Kansas City Royals, and the Milwaukee Brewers visit the Chicago Cubs. The largest single run-edge of the day is a -0.7 run total edge in the Red Sox-Orioles game, indicating the model projects significantly fewer runs than the market. This brief will refresh at 11:30 am Eastern, based on new analytics, weather factors, pitching changes, and line movement, so featured matchups and leans may update. Today's Best Bet is highlighted immediately below.

Today's Best Bet: Seattle Mariners ML

Today's Best Bet is the single game and line SharpSide has the highest confidence in, the Athletics @ Seattle Mariners. Our model projects the Seattle Mariners to win this game by a narrow 0.4-run margin, 4.2–3.8. This projected margin is roughly in line with the market's implied margin for the Mariners. This selection represents a conviction play from our model, not necessarily our biggest edge against current market pricing. While the game projects to be a slim victory, the model's certainty regarding the Mariners' win probability is the highest on the slate. Best Bet: Seattle Mariners ML (-212)

Boston Red Sox @ Baltimore Orioles

Tonight's game features Jake Bennett for the Boston Red Sox against Brandon Young for the Baltimore Orioles. Bennett enters with a strong 3.16 FIP, indicating excellent underlying pitching performance, and a low 0.277 xwOBA-against, suggesting he limits hard contact effectively. His 0.67 HR/9 is also well below the league average of 1.20, pointing to strong home run suppression. Conversely, Young's 4.32 FIP is slightly worse than league average (~4.10), and his 0.318 xwOBA-against indicates he allows more quality contact than Bennett. The Red Sox travel to Baltimore for this series opener. Baltimore's bullpen, with a 3.92 season relief ERA, is slightly better than the league average of 4.10. However, Boston's bullpen is notably stronger at 3.16, which causes a significant -0.42 run nudge to the Orioles' projected offense. Recent form sees the Red Sox struggling at 4-6 over their last 10 games, while the Orioles hold a respectable 6-4 record. Park and weather conditions are not expected to be a factor. The SharpSide model projects a 4.1–3.7 final score in favor of the Boston Red Sox, implying a tighter game than the market's 4.7–3.8 projection. The model is 0.5 runs more favorable to the Baltimore Orioles on the side than the market is. Boston's offense has been slightly lucky on balls in play this season with a .297 BABIP (league average .290), leading the model to regress their projected runs down by -0.10. Conversely, Baltimore's .286 BABIP suggests they've been unlucky, and the model adds +0.06 runs to their projection. Even so, the model still leans UNDER the total, primarily driven by Jake Bennett's strong underlying pitching metrics and the significant bullpen advantage for Boston. This is combined with the negative BABIP regression on Boston's offense, which pushes their projected total down. The largest driver of the UNDER lean is Bennett's effective run suppression. Lean: UNDER 8.5 total (-113)

First Five Innings: Miami Marlins @ Kansas City Royals (F5 UNDER)

The First Five Innings total between the Miami Marlins and Kansas City Royals also presents an UNDER opportunity. Marlins starter Sandy Alcantara carries a blended F5-only ERA of 3.46, reflecting solid early-game performance. Facing him is Michael Wacha, whose blended F5-only ERA is 3.41, indicating similar effectiveness over the first five frames. The model projects an F5 total of 3.38 runs for this matchup. This contrasts sharply with the market-implied F5 total of 4.73 runs. The Marlins' offense has been lucky on balls in play this season, with the model regressing their offense down by -0.11 runs, which contributes to the lower projected F5 total. The park multiplier of 0.964 also slightly dampens run scoring. Lean: F5 UNDER 4.5 total

Batter Prop: Ian Happ Over 0.5 Home Runs

Sharp market action has been observed on Ian Happ's Home Runs Over 0.5 prop in the Milwaukee Brewers @ Chicago Cubs matchup. The consensus price for this prop has moved from +474 to +383, representing a significant shift of 3.3 probability-points toward the OVER since opening. This aggressive line movement is historically indicative of sharp money entering the market, suggesting a higher likelihood of Happ hitting a home run than initially priced. Lean: Ian Happ Over 0.5 Home Runs (+383)

How the model decided

Today's SharpSide model divergences are primarily driven by pitching analytics, BABIP regression, and significant bullpen advantages. In the Boston Red Sox @ Baltimore Orioles game, the model's UNDER lean is heavily influenced by Jake Bennett's strong FIP and xwOBA-against, alongside Boston's superior bullpen, which noticeably nudges Baltimore's projected runs down. Offsetting BABIP luck for both teams further refines run projections, pushing Boston's projected total down and Baltimore's up, but the pitching and bullpen factors are more significant. For the Miami Marlins @ Kansas City Royals F5 UNDER, the core drivers are the efficient early-game performance from both starters and Miami's negative offensive BABIP regression. The model also considered advanced Sabermetric data, systems trends, and other analytics.

How to read this

These leans represent the SharpSide model's view of tonight's MLB slate compared to the prevailing market consensus. They are not 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.