Ullmark stopped 24 shots in Saturday's 6-3 win over the Islanders.
The Bruins dominated play in the early going, handing Ullmark a 4-1 lead before the four-minute mark in the second period, and the 28-year-old netminder didn't let the victory slip through his fingers. Ullmark's won three straight starts, giving him a career-high 20 wins on the season to go along with a 2.73 GAA and .908 save percentage.