Spezza scored at 10:46 and 13:05 of the second period to reach 300 goals, then completed a natural hat trick at 19:00 of the third period to give the Stars a 3-2 victory. He had 33 goals this season, his second with Dallas.
The 32-year-old scored 251 goals in 686 games with the Ottawa Senators and has 50 in 157 games with Dallas.