There's no limp, no lingering soreness, just an eagerness to play again. Troy Tulowitzki will begin a rehab assignment tonight with Triple-A Colorado Springs, leaving him in position to possibly join the Rockies over the weekend in Detroit. Tulowitzki is eligible to come off the disabled list Friday, but Sunday or Tuesday are more realistic dates. Tulowitzki is expected to remain with the Sky Sox, playing Thursday and likely Friday in Las Vegas. That would leave him in position to return to the big leagues either in Detroit or possibly Tuesday in Philadelphia when the Rockies open a three-game series there.