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Get Mariners vs Orioles baseball betting preview, spread and over/under insights for their matchup on Aug. 12.

The Mariners continued their climb towards the top of the American League West with a 3-1 win over the Athletics last night. Luis Castillo allowed one run over seven innings for his eighth win of the season as Seattle pulled to within three games of the top spot in the West. Lets dive into the matchup and find a sweat or two.