Joey Estes, making his MLB debut, might be outclassed here by a hungry Mariners team going for the sweep. Estes has struggled to keep the ball in the ballpark at Triple A, allowing 10 home runs in just under 33 innings, with an ERA north of five. George Kirby starts for the Mariners and he should handle this Oakland team as he did earlier this season. Seattle plays the Rangers in Texas after this, so tacking on another win vs the A's is crucial before that huge series. I expect them to keep their foot on the gas pedal here.

Oakland's 13th-ranked prospect, Joey Estes, will make his major-league debut Wednesday after posting a 5.32 ERA in seven appearances (six starts) at Triple-A Las Vegas. He'll be followed by MLB's worst bullpen (5.31 ERA). The A's have lost six straight by a combined 41-10 score. Seattle's George Kirby has been slumping, but this is a get-right spot. In his only start against Oakland this season, Kirby struck out 11 batters over seven innings, allowing three runs. I like that Seattle is guaranteed nine at-bats as the road team.