Red Sox going for the sweep in Philly, are ahead of the Phillies 4-1, top of the 3rd.
This is the fourth consecutive series that the Sox have played a first place team- Tigers, Rangers, Yankees (Yanks were in first place when the Sox-Yanks series started) and Phillies.
IF the Sox win today, they will finish that stretch at 10-2 (only 2 losses coming to the Rangers).
I'd have to do the research, but I can't recall a team playing four consecutive series (ALL different teams) against first place teams.