Hemsky beat Michael Houser with a deke to the backhand in the top half of the fourth round. Jussi Rynnas stopped all four Florida shooters in the tiebreaker, securing the victory with a save against Dave Bolland.
Dallas' Alex Goligoski tied it at 3 midway through the third period, and Patrick Eaves and Kevin Connauton also scored for the Stars. Dallas opened the preseason Monday night with a 4-3 victory over St. Louis.
Shane O'Brien, Bolland and Brandon Pirri scored for the Panthers in their first game under new head coach Gerard Gallant.