The Washington Nationals (30-47) and Seattle Mariners (37-39) open a 3-game set Monday at T-Mobile Park. First pitch is scheduled for 9:40 p.m. ET (MLB Network). Let’s analyze BetMGM Sportsbook’s lines around the Nationals vs. Mariners odds and make our expert MLB picks and predictions for the best bets.
Season series: First meeting of 2023; Mariners won last season’s series 3-1
The Nationals won 8-3 as +184 underdogs at the San Diego Padres Sunday, taking the series 2-1. Washington is 5-15 in its last 20 contests and is 5th in the NL East, 20 games behind the division-leading Atlanta Braves.
The Mariners lost 3-2 as -115 favorites at the Baltimore Orioles Sunday, dropping the series 2-1. Seattle has lost 4 of its last 6 contests and is 4th in the AL West, 9 1/2 games back of the division-leading Texas Rangers.
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Nationals at Mariners projected starters
RHP Trevor Williams vs. RHP Luis Castillo
Williams (4-4, 4.14 ERA) makes his 16th start. He has a 1.37 WHIP, 2.8 BB/9 and 6.9 K/9 in 76 innings.
- Last start: Win, 6 IP, 0 ER, 5 H, 0 BB, 4 K in 3-0 win vs. St. Louis Cardinals Wednesday
- Has won his last 2 decisions
- First career start vs. Mariners
Castillo (4-6, 2.89 ERA) makes his 16th start. He has a 1.05 WHIP, 2.8 BB/9 and 10.4 K/9 in 87 1/3 innings.
- Last start: Loss, 5 IP, 3 ER, 4 H, 4 BB, 3 K in 4-2 loss at New York Yankees Wednesday
- Has lost his last 4 starts despite allowing just 9 ER over that span
- Career vs. Nationals: 0-5, 4.81 ERA (33 2/3 IP, 18 ER), 32 H, 8 HR, 19 BB, 32 K in 6 starts
Nationals 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 12:36 p.m. ET.
- Moneyline (ML): Nationals +200 (bet $100 to win $200) | Mariners -250 (bet $250 to win $100)
- Run line (RL)/Against the spread (ATS): Nationals +1.5 (+105) | Mariners -1.5 (-125)
- Over/Under (O/U): 8 (O: -105 | U: -115)
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Nationals at Mariners picks and predictions
Prediction
Mariners 4, Nationals 2
Moneyline
Seattle (-250) should bounce back after losing 2 games in a row, but there’s no need to pay the higher price on the ML when the Mariners should win by multiple runs. Bet the run line and/or the total instead.
PASS.
Run line/Against the spread
Seattle has not lost 3 straight games since getting swept by the division-leading Rangers from June 2-4. Seven of the Mariners’ last 8 wins have been by multiple runs and it is unlikely that Castillo will lose a 5th straight start.
Washington has not won 3 straight games since May 2-4 and its last 6 losses have all been by 2 or more runs.
BET MARINERS -1.5 (-125).
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Over/Under
The Under is 4-1 in Washington’s last 5 games after scoring 5 or more runs in its previous contest and 4-1 in its last 5 interleague matchups.
The Under has hit in 5 of the last 6 meetings between these teams and should cash again Monday as Castillo bounces back after 4 straight losses.
BET UNDER 8 (-115).
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