Baltimore Orioles vs Seattle Mariners Prediction, Preview and Odds - 06/18/2026

Game Time: 4:10 pm ET, Thursday, June 18, 2026

Venue:  T-Mobile Park, Seattle, WA

Where to Watch:  MLB TV

DraftKings:  Moneyline odds:  Orioles +129, Mariners -156; Over/Under:  8 runs

Bet365:  Moneyline odds:  Orioles +130, Mariners -155; Over/Under:  8 runs

BetMGM:  Moneyline odds:  Orioles +125, Mariners -155; Over/Under:  8 runs

Baltimore Orioles:  34-40 (4th place, AL East)

Seattle Mariners:  38-36 (1st place, AL West)

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Baltimore Orioles:  3-7 last 10

Seattle Mariners:  5-5 last 10

The Orioles are entering this series off a loss and lost their 3-game series against the San Diego Padres 2-1 in their last series. They enter this game with a 34-40 record overall and have a road record of 12-21. This is the series finale of a 3-game series with the Mariners on Thursday with the 2nd game still to be played on Wednesday. The Orioles lost the series opener on Tuesday. Their offense ranks 13th in the MLB with a .723 OPS. Kyle Bradish is their starting pitcher on Wednesday while Shane Baz is making his start in this game on Thursday. He is 4-6 with a 4.06 ERA this season. His team won 3 of their last 4 games this season with him making an appearance. In his last MLB regular season appearance, he allowed 2 ER, 0 HR, and 2 BB with 1 SO on 6 hits through 5 IP against the San Diego Padres.

The Mariners are entering this series off a loss and lost their 3-game series against the Washington Nationals 2-1 in their last series. They enter this game with a 38-36 record overall and have a home record of 20-16. This is the 3rd game of a 3-game series with the Orioles on Thursday with the 2nd game of this series still to be played on Wednesday. The Mariners won the 1st game of this series on Tuesday. Their offense ranks 18th in the MLB with a .712 OPS. George Kirby is their starting pitcher on Wednesday while Bryan Woo is making his start in this game on Thursday. He is 5-5 with a 4.28 ERA this season. His team lost their last 2 straight games this season with him making an appearance. In his last MLB regular season start, he allowed 7 earned runs, 2 homers, and 1 walk with 4 strikeouts on 7 hits through 5 innings pitched against the Baltimore Orioles.

The current betting odds have the Orioles listed as an underdog in this game according to Draftkings Sportsbook. The Mariners have looked good in their games this season with their 38-36 record overall which has them right at the top of the AL West. They have looked better in their own ballpark too with their 20-16 home record this season. Meanwhile, the Orioles haven't looked good in their games this season with their 34-40 record overall which has them right near the bottom of the AL East. They have been a terrible road team too with their 12-21 road record this year. The Orioles have looked terrible lately as they are 3-7 in their last 10 games while the Mariners are 5-5 in their last 10, but these two just split a series last week and neither has looked great lately. The Orioles are going with Baz in this one and he hasn't looked great this season. He is 4-6 with a 4.06 ERA, but lately he hasn't been giving up many runs. He is coming off another good start in which he gave up 2 earned runs and the team has been having success with him lately, winning 3 of their last 4 games with him starting. The Mariners are going with Woo in this one and he hasn't looked great this season. He is 5-5 with a 4.28 ERA and he has been giving up quite a few runs lately. He is coming off a terrible start in which he gave up 7 earned runs which has become a common theme lately, and the team has lost 2 games in a row now with him starting too. The Orioles have the better offense entering this series and they can take advantage of this pitching matchup with the way Woo has had trouble lately. The bullpen hasn't looked great for the Mariners either with a lot of runs given up in that series against the Orioles last week. The best way to place a bet here is on the Orioles to win this game. 

Orioles Mariners Prediction:  Our MLB Pick for Thursday, June 18, 2026 (4:10 pm ET start time) is Orioles 7 Mariners 5.

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Baltimore Orioles: 200-200 (-24.5 units) on the moneyline in all games. 148-140 (-13.5 units) on the moneyline against right-handed starters. 95-107 (-11 units) on the moneyline when playing against a team with a winning record. 22-13 OVER as an underdog of +100 or higher.

Seattle Mariners: 123-81 (+15.9 units) on the moneyline in home games. 104-65 (+10.4 units) on the moneyline as a home favorite of -110 or higher. 27-18 (+5 units) on the moneyline vs. a team with a poor bullpen whose ERA is 4.20 or worse. 7-3 OVER as a home favorite of -150 or more.

Baltimore Orioles:  C. Bassitt (SP) Fifteen Day IL - Back. D. Beavers (RF) Ten Day IL - Oblique. C. Povich (SP) Fifteen Day IL - Elbow. D. Kremer (SP) Sixty Day IL - Quad. R. Mountcastle (1B) Sixty Day IL - Foot. Y. Hiraldo (RP) Sixty Day IL - Shoulder. Z. Eflin (SP) Sixty Day IL - Elbow. J. Westburg (3B) Sixty Day IL - UCL. F. Bautista (RP) Sixty Day IL - Shoulder. C. Selby (SP) Sixty Day IL - Shoulder.

Seattle Mariners:  L. Raley (RF) Day To Day - Back. J. Naylor (1B) Day To Day - Leg. R. Arozarena (LF) Ten Day IL - Leg. M. Brash (RP) Fifteen Day IL - Lat. C. Criswell (RP) Fifteen Day IL - Shoulder. B. Donovan (3B) Ten Day IL - Groin. C. Raleigh (C) Ten Day IL - Side. W. Wilson (3B) Sixty Day IL - Thumb. C. Vargas (RP) Sixty Day IL - Lat. L. Evans (SP) Sixty Day IL - Arm.

"BY did more than enough for us to win the game. He kept us in the game." - Craig Albernaz after his team’s loss against the Mariners in their game on Tuesday. 

“I think I saw Cal smile tonight. I think that’s a big key, to be honest with you. Just having fun with the game. He’s an exceptional player, we all know that, but I think he found the joy of the game, and that’s what’s important.” - Dan Wilson after his team’s win against the Orioles in their game on Tuesday. 

Taylor Ward (R) LF

Gunnar Henderson (L) SS

Adley Rutschman (S) C

Pete Alonso (R) 1B

Samuel Basallo (L) DH

Leody Taveras (S) RF

Colton Cowser (L) CF

Blaze Alexander (R) 3B

Jackson Holliday (L) 2B

J.P. Crawford (L) 3B

Cal Raleigh (S) C

Julio Rodríguez (R) CF

Dominic Canzone (L) RF

Rob Refsnyder (R) DH

Cole Young (L) 2B

Victor Robles (R) LF

Colt Emerson (L) SS

Miles Mastrobuoni (L) 1B

Batting Average:  Blaze Alexander (.297)

Hits:  Pete Alonso (70)

Home Runs:  Pete Alonso (16)

RBI:  Pete Alonso (48)

Stolen Bases:  Leody Taveras (8)

Wins:  Brandon Young (5)

Saves:  Ryan Helsley (7)

ERA:  Jose Espada (0.00)

Batting Average:  Randy Arozarena (.291)

Hits:  Randy Arozarena (76)

Home Runs:  Luke Raley (14)

RBI:  Luke Raley (35)

Stolen Bases:  Randy Arozarena (19)

Wins:  George Kirby (5)

Saves:  Andrés Muñoz (11)

ERA:  Nick Davila (0.00)

Managers:

Baltimore Orioles: Craig Albernaz (1st season)

Seattle Mariners: Dan Wilson (3rd season)