Leyer's contract was purchased by Boston on Monday, Chris Cotillo of The Springfield Republican reports.

EDGE Analysis

The 27-year-old righty is set to make his big-league debut. He recorded an unimpressive 5.24 ERA in 56.2 minor-league innings in the upper levels of the Mariners' and Red Sox's systems last year, with a 14.3 percent walk rate offsetting a 27.4 percent strikeout rate.