Shaw was called up from Triple-A Pawtucket prior to Sunday's game against the Blue Jays, Mike Silverman of the Boston Herald reports. Shaw will give the Red Sox a natural first baseman to back up Mike Napoli, as Brock Holt is more optimally suited as a utility man. Don't expect Shaw to see much action aside from when Napoli rests or if the team is in need of a left-handed pinch hitter.