Boston Red Sox at Seattle Mariners odds, picks and prediction

Analyzing Monday’s Boston Red Sox at Seattle Mariners odds and lines, with MLB expert picks and predictions.

The Boston Red Sox (81-64) visit the Seattle Mariners (77-66) Monday to start a three-game set at T-Mobile Park with the first pitch scheduled for 10:10 p.m. ET. Let’s analyze the lines around the Red Sox vs. Mariners odds with MLB picks and predictions.

Season series: Tied 2-2.

LHP Eduardo Rodriguez takes the mound for the Red Sox. He is 11-8 with a 5.15 ERA (136 1/3 IP, 78 ER), 1.39 WHIP, 2.6 BB/9 and 10.5 K/9 over 27 starts.

  • Last outing: Loss, 12-7, with 3 2/3 IP, 6 ER, 8 H, 0 BB and 3 K Tuesday against the Tampa Bay Rays.
  • Rodriguez beat Seattle April 25, 5-3, with a stat line of 7 IP, 3 ER, 6 H, 0 BB and 8 K.
  • vs. Mariners on the current roster (59 PA): 2.21 FIP with a .232 batting average, .290 wOBA, .307 expected slugging percentage, 30.5 K% and 85.9 mph exit velocity.

RHP Logan Gilbert is on the hill for the Mariners. He is 5-5 with a 5.10 ERA (95 1/3 IP, 54 ER), 1.23 WHIP, 2.0 BB/9 and 10.0 K/9 in 20 starts.

  • Last outing: No-decision in Seattle’s 5-4 loss at the Houston Astros  Tuesday with 4 1/3 IP, 2 ER, 6 H, 1 BB and 5 K.
  • 2021 home stats: 1-3 with a 5.13 ERA (52 2/3 IP, 30 ER), 1.22 WHIP and 7.9 K/BB through 11 starts.

Red Sox at Mariners odds, lines, picks and prediction

MLB odds provided by Tipico Sportsbook; access USA TODAY Sports for a full list. Odds last updated at 4:20 p.m. ET.

  • Money line: Red Sox -125 (bet $125 to win $100) | Mariners +102 (bet $100 to win $102)
  • Against the spread/ATS: Red Sox -1.5 (+133) | Mariners +1.5 (-165)
  • Over/Under: 7.5 (O: -120 | U: -105)

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Prediction

Mariners 4, Red Sox 2

Money line (ML)

GIMME the MARINERS (+102) for 1 unit because I give them a slight edge in the pitching department even though Gilbert is hitting a bit of a rookie wall and there’s “reverse line movement” headed in Seattle’s direction.

Around 70% of the cash wagered is on the Red Sox, according to Pregame.com, but Boston’s money line has gotten cheaper since the betting market opened and it’s always a red flag when sportsbooks make the more popular side cheaper.

Furthermore, Seattle’s bullpen has been far more reliable than Boston’s since the All-Star break. Red Sox relievers’ ERA is more than 1.5 runs higher than the Mariners’ over that span and Boston’s bullpen ranks 20th or worse in xFIP, SIERA and K-BB% in the second half.

On top of that, the Mariners are 30-25 against lefty starters and are slightly more productive at the plate against left-handed pitching.

Seattle’s lineup ranks around the same as Boston’s in several advanced hitting metrics over the past two weeks; however, the Mariners have a much better BB/K and the Red Sox have a .332 BABIP while Seattle’s lineup has a .253 BABIP.

Lastly, Seattle is always a live dog at home as the Mariners have the most wins as home underdogs and the second-best winning percentage in that spot this season.

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Run line/Against the spread (ATS)

PASS with a slight “lean” to the Mariners +1.5 (-165) since they have the third-best cover rate as home underdogs at 31-13 ATS and the Red Sox are just 9-18 ATS as road favorites.

While Seattle’s run line is a little pricier than I’d like it to be, I’d entertain throwing it into a parlay with perhaps the New York Mets’ run line for a plus-money payout.

Over/Under (O/U)

Slight “LEAN” to the UNDER 7.5 (-105) for a tiny wager if at all because I much prefer Seattle’s money line more than the total in this spot.

However, there is a “pros vs. joes” scenario in the betting market with the presumed “sharp” money being on the Under whereas the public money is on the Over despite these teams having a combined 27-18 O/U record when these starters are on the mound. Plus, Seattle’s home ballpark has the fourth-lowest runs scored by park factors and is a notoriously pitcher-friendly park.

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