"I know what they want and what they're looking for and I'm ready to do it," said Berry. "I haven't been completely told, but I got a good understanding that I'll be coming off the bench pinch-running for guys late in the game, steal bases. That's what I'm going to do."
In Red Sox history, no player was more famous in that role than Dave Roberts, who stole the biggest base in team history in Game 4 of the 2004 American League Championship Series.
"I've learned a lot when it comes to basestealing," said Berry. I'm not just out there running like I was when I was young. I have an idea what pitchers are trying to do and what their coaches are trying to do and what I'm capable of doing allowed me to have better percentages."
The 28-year-old Berry played 94 games for the Tigers last season, stealing 21 bases.
"I just think that this was a good move on Boston's part," Tigers manager Jim Leyland said. "I'm sure that they brought him up there for the sole reason that they saw his numbers last year on stolen bases. It's a great situation for him to get a little more time. Certainly he filled that bill for us, and sporadically last year he got us going.
"Now for whatever reason, I don't know why this year was so bad. He had a bad year at [Triple-A] Toledo and [Triple-A] Omaha. I don't know if that was lingering disappointment or what, but he did a heckuva job for us. Had he been right-handed and able to play third base and first base and the outfield, he'd have been on our team. That was a little hard for him to understand."
"Well we set out to find that type of player and Quintin is someone who has had a long track record in the Minor Leagues as a successful basestealer and even for the opportunity at the big league level, the success rate is probably as good as it gets, I think it's 21 stolen bases, zero caught, and he fills a specific need in that role for us," said Red Sox manager John Farrell.
Utility infielder John McDonald, acquired from the Phillies on Saturday night, was expected to arrive by the start of Sunday's game, and was added to the roster.
"Depth in the middle of the infield, seasoned veteran, an elite defender. Again, fills a specific need," Farrell said.
The Red Sox also added catcher Ryan Lavarnway and right-hander Rubby De La Rosa from Triple-A, both of whom have served multiple stints on the Major League roster this season. And infielder Brandon Synder was activated from the disabled list.
Boston will make more roster additions in the coming days, particularly when Triple-A Pawtucket's postseason run ends.