Boston will then send Masterson back to Portland after his start to make room on the roster for Triple-A righthander Bartolo Colon, who will start on Wednesday.
Masterson made his major league debut against the Angels on April 24, when he allowed one run and struck out four in six innings with four walks and two hits allowed. The Red Sox sent Masterson back to Portland after that start, and the results haven’t been so great for the 6-foot-6, 250-pound righthander.
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On the season, Masterson’s overall numbers have been strong, with a 37-16 K-BB ratio, a 2.8-to-1 groundout-to-airout ratio in 38 1/3 innings and a 4.23 ERA.