Right-handed pitcher Luis Castillo is scheduled to take the mound for the Mariners (54-47) at T-Mobile Park in Seattle. His earned run average in his last three appearances is just 1.45. Right-hander Quinn Priester will pitch for the Brewers (60-41). His ERA in his previous three appearances is 3.24.

The Mariners were unable to unseat one of the hottest teams in the National League and further reaffirmed the need to improve at the trade deadline.

Wednesday's start was one of Luis Castillo’s worst of the season, as the Mariners’ veteran allowed six runs over five innings in a lopsided 10-2 loss.