Markstrom made 30 saves in Thursday's 3-1 win over the Senators.
The veteran netminder appeared headed for his 21st career shutout until Brady Tkachuk scored through traffic on the power play with 65 seconds left in the third period. Markstrom has had a strong start to his New Jersey tenure, going 3-2-0 in five starts with a 2.42 GAA and .918 save percentage and providing the Devils with the stability between the pipes they lacked last season.