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MLB Betting Guide: Monday 9/13/21

Which MLB games offer betting value on FanDuel Sportsbook? Let's see where we can zero in.

Please note that lines are subject to change after this article is published, which impacts betting advice. All betting lines were taken from FanDuel Sportsbook, and you can check here to see their most updated numbers. You can also look at our oddsFire tool to get a feel for what the betting public is doing.

Seattle Mariners Moneyline: +108; 1 Star out of 5

The Seattle Mariners and Boston Red Sox are both still battling for wild card spots, and this series will have a major impact on who makes it to the postseason.