Webster, 23, began this season in the starting rotation for Pawtucket, where he has no record with an 0.90 ERA (1 ER/10.0 IP) in two starts. He has struck out 12 batters and issued only three walks while holding opponents to a .194 batting average (7-for-36). Prior to this season, Baseball America ranked him the No. 4 prospect - and No. 2 pitcher - in the Red Sox minor league system. He was acquired by Boston from the Dodgers last August in the nine-player trade that sent Josh Beckett, Adrian Gonzalez, Carl Crawford, Nick Punto, and cash considerations to Los Angeles.
Webster, who will wear No. 64, is scheduled to start the second game of today's doubleheader. It will be his major league debut.