The Pittsburgh Pirates and the Seattle Mariners start a three-game interleague series in Seattle. The Pirates will send Mitch Keller to the mound to face the Arizona Diamondback's George Kirby. The Pittsburgh Pirates are 5-16 in their last 21 games. The Mariners have won four of the last five games against the Pirates. In May Mitch Keller is 2-1 with a 1.00 ERA in four starts while George Kirby is 3-1 with a 2.28 ERA in his four starts. The under has hit in 11 of the previous 16 games against one another.

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