Blackburn, on the disabled list with a left quad strain, gave up one run on two hits and a walk over just 2 1/3 innings against Triple-A Columbus. The sinkerballer threw only 27 pitches before the game was delayed for 45 minutes due to rain.
It was scheduled to be Blackburn's final rehab outing before rejoining the Twins rotation. Blackburn made his first rehab start last Tuesday, allowing four runs (three earned) on four hits and three walks over 3 2/3 innings against Triple-A Charlotte.
Twins manager Ron Gardenhire said after Minnesota's 6-3 win over the Indians on Sunday that the club has not decided if Blackburn will need another rehab start or if he'll be activated and rejoin the rotation.
"Blackie only threw  pitches so we have to make a decision here," Gardenhire said. "So we're just going to enjoy the win and get to Kansas City and see how everybody is. And then we'll fill up the Internet world with all sorts of information."