Baltimore Orioles at Seattle Mariners odds, picks and predictions

Analyzing Friday’s Baltimore Orioles at Seattle Mariners odds and lines, with MLB expert picks, predictions and best bets.

The Baltimore Orioles (71-44) and Seattle Mariners (62-52) will open a 3-game series on Friday at T-Mobile Park. First pitch is set for 10:10 p.m. ET (MLB Network). Let’s analyze BetMGM Sportsbook’s lines around the Orioles vs. Mariners odds and make our expert MLB picks and predictions for the best bets.

Season series: Orioles lead 2-1

The Orioles are 7-3 in their last 10 games but they avoided being swept in a 3-game series vs. the Houston Astros with a 5-4 win Thursday. Baltimore still leads the AL East by 3 games and has scored the 6th-most runs in the league (567).

The Mariners enter on a 7-game win streak and have won 9 of their last 10 to pull within 5 1/2 games of the Texas Rangers for the lead in the AL West. Seattle owns the 2nd-lowest team ERA in the majors (3.74).

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Orioles at Mariners projected starters

RHP Kyle Gibson vs. RHP Luis Castillo

Gibson (11-6, 4.50 ERA) makes his 25th start. He has a 1.28 WHIP, 2.8 BB/9 and 7.5 K/9 through 140 IP.

  • Last start: Win, 7 IP, 3 ER, 4 H, 1 BB, 9 K in 7-3 home victory vs. New York Mets Saturday
  • 2023 road stats: 6-3, 3.95 ERA (84 1/3 IP, 37 ER) across 14 starts
  • Career vs. Mariners: 4-5, 4.21 ERA (77 IP, 36 ER) in 14 starts
  • 2023 vs. Mariners: Loss, 3 IP, 5 ER, 7 H, 3 BB, 4 K in 13-1 home loss on June 23

Castillo (7-7, 3.21 ERA) makes his 24th start. He has a 1.05 WHIP, 2.2 BB/9 and 10.2 K/9 through 137 1/3 IP.

  • Last start: No-decision, 6 IP, 7 ER, 10 H, 1 BB, 6 K in 9-7 road victory vs. Los Angeles Angeles last Friday
  • 2023 home stats: 5-3, 2.79 ERA (77 1/3 IP, 24 ER) over 13 starts
  • First career start vs. Orioles

Orioles at Mariners odds

Provided by BetMGM Sportsbook; access USA TODAY Sports Scores and Sports Betting Odds hub for a full list. Lines last updated at 10:07 a.m. ET.

  • Moneyline (ML): Orioles +120 (bet $100 to win $120) | Mariners -145 (bet $145 to win $100)
  • Run line (RL)/Against the spread (ATS): Orioles +1.5 (-175) | Mariners -1.5 (+145)
  • Over/Under (O/U): 8 (O: +100 | U: -120)

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Orioles at Mariners picks and predictions

Prediction

Mariners 4, Orioles 3

Moneyline

The Mariners have been red hot lately, winning 9 of their last 10 games by sweeping the San Diego Padres (2 games) and Los Angeles Angels (4 games) and taking 2 of 3 from the Boston Red Sox. The Orioles are playing some quality baseball right now, too, but it’s the Mariners who have been more impressive.

With Castillo on the mound boasting a 2.79 ERA at home, I like the Mariners’ chances Friday. BET MARINERS (-145) despite the juice.

Run line/Against the spread

Even though the Mariners have won 5 of their last 7 games by at least 2 runs, this is likely to be a close game against a strong opponent. You could SPRINKLE a bit on the MARINERS -1.5 (+145) but it’s risky to do so if you’re already betting on the moneyline.

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Over/Under

There’s been no clear trend with the Over/Under for either team lately. The Over is 5-5 in the Orioles’ last 10 games and it’s 4-5-1 in the Mariners’ last 10. The total has only gone Over once in Gibson’s last 4 starts and once in Castillo’s last 3.

BET UNDER 8 (-120).

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