In the third game of a four game MLB betting lines series at Kaufmann Stadium in Kansas City, the Seattle Mariners will take on the Kansas City Royals. Coming into the four game series, the Seattle Mariners came in with a 43-42 record. The Mariners were in third place in the American League West; trailing the Rangers and Astros. For Kansas City, they are the defending World Series champion. The Royals are 43-41, which is fourth place in the American League Central. The Royals are 8 games back of first place Cleveland.