For De La Rosa, who was acquired in the Aug. 25, 2012, blockbuster with the Dodgers, this will be his first start with the Red Sox. The righty did pitch in 11 games out of the bullpen for Boston last season.
In 10 starts for Triple-A Pawtucket this season, De La Rosa is 2-3 with a 3.04 ERA. Over his past two starts, De La Rosa has given up two runs over 11 innings.
Allen Webster also received strong consideration for the start.
Why did Farrell go with De La Rosa?
"The recommendation of the staff in Pawtucket," Farrell said. "You look at their numbers overall on the course of the year, they're pretty similar. The last two starts for Rubby have been strong, and that was pretty much the deciding factor."
Brandon Workman is filling Felix Doubront's spot in the starting rotation after the left-hander went on the DL on May 21 with a left shoulder sprain. Workman makes his second start of the season on Friday night.
Ian Browne is a reporter for MLB.com. Read his blog, Brownie Points, and follow him on Twitter @IanMBrowne. Quinn Roberts is a reporter for MLB.com This story was not subject to the approval of Major League Baseball or its clubs.