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Boston Red Sox vs. Seattle Mariners odds, tips and betting trends | May 21

On Saturday, the Seattle Mariners (17-23) are visiting the Boston Red Sox (17-22), at 4:10 PM ET. The Red Sox have taken three straight.

The Red Sox are favored (-153 on the moneyline) when they host the Mariners (+132). The matchup on the mound for this contest is set with the Boston Red Sox looking to Garrett Whitlock (1-1), and Chris Flexen (1-6) taking the ball for the Seattle Mariners.

Austin Davis (1.1 IP, 0 R, 0 H, 2 K) earned the win in the Red Sox’s 7-3 victory over the Mariners yesterday. Trevor Story led the way offensively, going 1-for-4 with a home run and four RBI. Robbie Ray (6.0 IP, 4 R, 5 H, 8 K) took the loss for the Mariners.

Here is everything you need to get ready for Saturday’s Red Sox vs. Mariners contest.

Boston Red Sox vs. Seattle Mariners Odds and Betting Lines

Major League Baseball odds courtesy of Tipico Sportsbook. Odds updated Saturday at 2:04 AM ET. For a full list of sports betting odds, access USA TODAY Sports Betting Scores Odds Hub.

  • Favorite: Red Sox (-153, bet $153 to win $100)
  • Underdog: Mariners (+132, bet $100 to win $132)
  • Over/under: 9

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Red Sox Stats and Trends

Red Sox Betting Records

  • This season, the Red Sox have won nine out of the 18 games, or 50%, in which they’ve been favored.
  • This season, Boston has been at least a -153 favorite on the moneyline three times, losing each of those contests.
  • The Red Sox have a 60.5% chance to win this game based on the implied probability of the moneyline.
  • Boston and its opponents have hit the over in 13 of their 39 games with a total this season.
  • The Red Sox are 21-18-0 ATS in their 39 games with a spread this season.

Garrett Whitlock (Red Sox Probable Starter)

  • The Red Sox will send Whitlock (1-1) to the mound for his sixth start this season.
  • The right-hander’s last start was on Monday, when he tossed five innings while giving up two earned runs on three hits in a matchup with the Houston Astros.
  • The 25-year-old has pitched in nine games this season with an ERA of 2.43, a 3.7 strikeout-to-walk ratio and a WHIP of .944.
  • Whitlock has not earned a quality start in five starts this season.
  • In five starts, Whitlock has pitched through or past the fifth inning two times. He has a season average of 3.1 frames per outing.
  • The Mariners are batting .231 this season, 18th in MLB. They have a team slugging percentage of .374 (18th in the league) with 41 home runs.

Red Sox Batting Stats

  • The Red Sox’s 30 home runs rank 24th in Major League Baseball.
  • The offense for the Red Sox has a slugging percentage of .379 this season, 16th in MLB.
  • Boston’s .242 batting average ranks 12th in the league this season.
  • The Red Sox have scored 160 runs (4.1 per game) this season, which ranks 16th in MLB.
  • Boston has an on-base percentage of .298 this season, which ranks 21st in the league.
  • The Red Sox have shown patience at the plate this season with the 10th-best rate of strikeouts per game (8.0) among MLB offenses.

Mariners Stats and Trends

Mariners Betting Records

  • The Mariners have been underdogs in 29 games this season and have come away with the win 10 times (34.5%) in those contests.
  • Seattle has a mark of 2-4 in contests where oddsmakers favor them by +132 or worse on the moneyline.
  • Bookmakers have implied with the moneyline set for this matchup that the Mariners have a 43.1% chance of pulling out a win.
  • Contests with Seattle have gone over the total set by oddsmakers in 20 of 40 chances this season.
  • The Mariners have an against the spread record of 20-20-0 in 40 games with a line this season.

Chris Flexen (Mariners Probable Starter)

  • Flexen makes the start for the Mariners, his eighth of the season. He is 1-6 with a 4.35 ERA and 29 strikeouts through 39 1/3 innings pitched.
  • His most recent appearance came on Monday against the Toronto Blue Jays, when the right-hander threw 5 1/3 innings, surrendering three earned runs while allowing six hits.
  • The 27-year-old has a 4.35 ERA and 6.6 strikeouts per nine innings during seven games this season, while allowing a batting average of .260 to opposing batters.
  • Flexen enters this game with three quality starts under his belt this year.
  • Flexen will try to prolong a seven-game streak of lasting five or more innings (he’s averaging 5.2 frames per appearance).
  • The opposing Red Sox offense has a collective .242 batting average, and is seventh in the league with 321 total hits and 16th in MLB play with 160 runs scored. They have the 16th-ranked slugging percentage (.379) and are 24th in all of MLB with 30 home runs.

Mariners Batting Stats

  • The Mariners rank eighth in baseball with 41 home runs. They average 1.0 per game.
  • So far this season, the Mariners’ .374 slugging percentage is 18th in baseball.
  • Seattle’s .231 batting average ranks 18th in the league.
  • Averaging 3.9 runs per game (155 total), the Mariners are the 20th-highest scoring team in MLB play.
  • Seattle’s .313 on-base percentage is 10th-best in baseball.
  • The Mariners strike out 8.3 times per game to rank 18th in the league.

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