The Cubs are moving forward with the plan to add a sixth starter to the rotation. Left-hander Brian Matusz is being called up Sunday to start the finale of the three-game series against the Mariners. The Cubs optioned Justin Grimm to Triple-A Iowa to make room for Matusz on the 25-man roster. Matusz will take the open spot on the team’s 40-man roster.
Matusz signed a minor league contract in June and he appeared in five games in the Cubs system, the last two with Triple-A Iowa. Matusz made two starts for the I-Cubs and allowed two runs on seven hits with three walks and 11 strikeouts in 9 1/3 innings.