The Ducks denied Soderblom his first NHL shutout when McGinn's shot squeezed through his pads and slid across the goal line to cut it to 3-1 at 10:16 of the third period.
The Blackhawks made it 4-1 when Donato knocked a loose puck off Dostal's skate and across the goal line at 17:43.
"There's four or five times in the third period when it was 3-1 that we have an opportunity to throw it at the net from a decent scoring area, with an opportunity for a driving forward to get a rebound, and we just won't do it," Cronin said. "That's where my blood pressure goes up."
McTavish scored a power play-goal with Dostal pulled for the extra attacker for the 4-2 final with four seconds left.
"That's what we're trying to learn is, sometimes, you've got to win games maybe you don't deserve to win," Bedard said. "I think we did that [on Saturday] and then came in today and weren't satisfied with that, so definitely some things we're going to take away."
NOTES: Bedard has nine points (one goal, eight assists) in four games against the Ducks. ... Donato's goal stretched his point streak to five games (five goals, two assists), matching his NHL career high. ... Dostal, who came into Sunday leading the NHL with a .945 save percentage, had not allowed a goal in the first two periods in his previous five starts.