Welington Castillo is expected to start Thursday's series finale against the Orioles, Bob Dutton of the Tacoma News Tribune reports.

Castillo will start Thursday's series finale against the Orioles, Bob Dutton of the Tacoma News Tribune reports.

Analysis:

After carrying three catchers for the first month and a half of the season, the Cubs finally found a trade parter for Castillo in the Mariners. The 28-year-old Castillo is expected to step in behind the plate Thursday to face right-hander Chris Tillman in his debut with Seattle, and considering how much Mike Zunino has struggled offensively (.173/.233/.345), it seems possible Castillo will eventually take on a significant share of the workload.