Mariners vs Orioles Odds, Picks & Player Props for August 12

• The Seattle Mariners, one of the hottest teams in baseball, visit the Baltimore Orioles on Tuesday night
• The pitching matchup features Seattle stud George Kirby against an inconsistent Dean Kremer for Baltimore
• Check out the SEA/BAL odds, plus my favorite Mariners vs Orioles picks and player props to target

The Seattle Mariners (66-53, 29- 28 away, 64-50-5 O/U) bring a seven-game win streak to Camden Yards on Tuesday as they open a three-game series with the Baltimore Orioles (53-65, 28-29 home, 50-63-5 O/U). First pitch for this series opener is scheduled 6:35 pm ET.

The Mariners will start right-hander George Kirby, who has been nothing short of brilliant over his last eight starts. He looks to set the tone against a slumping Orioles club that will counter with their own righty, Dean Kremer, who enters with an 8-8 record and a 4.35 ERA.

While Kirby has found his groove, boasting a stellar 2.66 ERA over his last eight outings, Kremer and the Orioles have struggled, dropping the last four games in which he has started. The Mariners’ offense has been a juggernaut, averaging 5.5 runs per game during their recent 9-1 stretch, powered by a scorching-hot Julio Rodríguez and the consistent power of Cal Raleigh. For the Orioles, who have lost seven of their last 10, the challenge will be generating enough offense against an in-form pitcher while trying to contain a lineup that has been punishing opponents.

Jump to: Odds | Pitcher-vs-Batter Stats | Player Props | Picks

Seattle Mariners vs Baltimore Orioles Odds

The odds show Seattle as a significant road favorite, a nod to their recent hot streak and the on-paper pitching advantage. The Mariners’ moneyline price of -175 gives Seattle a 60.7% vig-free implied win probability, leaving the O’s at just 39.3%. The total is set at a relatively high 9.0 runs, suggesting that, while Kirby is pitching well, the potent Mariners offense is expected to do significant damage against Kremer and a depleted Orioles pitching staff.

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SEA vs BAL Odds Movement

The betting market has moved decisively toward the Seattle Mariners since the lines opened. Seattle’s moneyline price has shifted from an opening number of -144 to the current -175, a significant 31-cent move that underscores heavy betting action on the road favorites. The runline has also seen movement in Seattle’s favor, tightening from +101 to -107 on the -1.5 spread. The total has remained stable at 9.0 runs.

This pronounced line movement is driven by a confluence of factors. First, the MLB public betting splits show that 74% of bets and a whopping 87% of the money are on the Mariners’ moneyline, indicating that both casual bettors and larger, sharper wagers are backing Seattle. This confidence stems from the teams’ diverging trajectories: the Mariners have won nine of their last ten, while the Orioles have lost seven of their last ten.

The pitching matchup also heavily favors George Kirby, who has been one of the league’s best pitchers since July 1. The Orioles, meanwhile, have lost each of Kremer’s last four starts. The Orioles’ extensive injury list, particularly on their pitching staff, further cements Seattle’s advantage in the eyes of the market.

Starting Pitcher-vs-Batter History

The history between these pitchers and the opposing lineups reveals some distinct advantages and potential trouble spots, especially for the O’s starter.

Seattle Mariners Career Statistics vs Dean Kremer

Dean Kremer has been absolutely tormented by Julio Rodríguez, who has reached base five times and slugged 1.750 with one home run in just eight at-bats. He’s also had a nightmare time trying to retire Josh Naylor (.667 average with a home run in nine at-bats) and Mitch Garver (.500 average with a home run in six at-bats). Randy Arozarena has hit .333 with two homers in nine at-bats. Jorge Polanco and JP Crawford have also taken Kremer yard.

Baltimore Orioles Career Statistics vs George Kirby

George Kirby has been tough on the Orioles lineup, overall, but Gunnar Henderson has been a significant outlier, hitting .462 with a home run and a 1.231 OPS in 13 at-bats. Adley Rutschman and Jordan Westburg have also held their own, but Kirby has otherwise kept the Baltimore bats in check.

Mariners vs Orioles Player Props

MLB player props as of August 12 at DraftKings.

For the props, George Kirby’s line for over 17.5 outs (completing 5.2 innings) at -185 looks promising given his recent form, where he has consistently pitched deep into games. The Mariners have won five of the last six games he’s started. For the Orioles, Dean Kremer’s earned runs prop of over 2.5 at -140 is appealing. He faces a red-hot Mariners offense that is averaging 5.5 runs over its last ten games, and Kremer has shown vulnerability, particularly to left-handed power, which Seattle possesses.

Mariners vs Orioles Picks & Prediction

The momentum and on-paper advantages all point squarely in the direction of the Mariners. The primary driver is the pitching matchup: George Kirby has been electric, posting a 2.66 ERA over his last eight starts with elite command, backed by strong underlying metrics (3.47 xERA). The Mariners have thrived when he’s on the mound, winning five of his last six starts.

Conversely, Dean Kremer has been inconsistent, and the Orioles have lost his last four starts. Kremer has struggled with left-handed power, a major red flag against a Mariners lineup featuring switch-hitters Jorge Polanco and Cal Raleigh, as well as lefty Josh Naylor.

While historical trends show the Orioles have had success against the Mariners recently (6-1 in their last seven meetings), that feels like a distant memory given the current state of both clubs. The Mariners are 8-2 as a favorite in their last ten games, while the Orioles are just 3-7 over their last ten games overall.

Baltimore’s lineup has been sputtering, and their bullpen is decimated by injuries, removing the safety net that once made them formidable in close games. Seattle has been winning by multiple runs during this streak, and against a struggling, injury-plagued Orioles team, they are well-positioned to do so again.

Picks:

• Seattle Mariners -1.5 (+100) at Caesars
• Over 9.0 runs (-115) at bet365