Blackhawks No. 1 goaltender Corey Crawford didn't dress as a precaution because of lower-body stiffness, according to coach Joel Quenneville.
Crawford, who played every minute of Chicago's 2013 Stanley Cup playoff run, is expected to start Tuesday. The Blackhawks will raise a banner in a ceremony before that contest to celebrate their fifth NHL championship and second in four seasons.
Leddy opened the scoring 5:52 in on a high screeened shot after pinching into the slot.
Grabovski tied it at 4:48 of the second by completing a breakaway, but Leddy put Chicago ahead 2-1 on a low screened shot from the left point 3:30 later.
Johansson tied it at 2-all at 3:32 of the third on a low shot from the left circle that fooled Khabibulin.
Hayes put Chicago ahead 3-2 at 6:52 of the third, but Ward scored from 15 feet out with 5:01 left in regulation to set up overtime.