It turned out to be a battle to the end, when Dulaney's Armani Graves' driving shot with two seconds left went high off the glass, and Mount de Sales escaped with a 50-48 victory Friday night in Timonium.
Mount de Sales coach Trish Armstrong was relieved her team didn't blow the eight-point, fourth-quarter lead.
After all, the Sailors wasted a seven-point, second-half advantage in their season opener to John Carroll and lost by two points.
This time, Mount de Sales' defense forced four Dulaney turnovers in the last two minutes as the Lions went 0-for-5 from the field.
A Nicole Sharpe free throw was Dulaney's only points during that stretch.
"We just picked up the defensive intensity," Armstrong said. "We thought we were a little fatigued, so we called the presses off and saved them for the last few minutes."
The pressure almost became too much for the Lions in their season opener.
"I think we were a little flustered and a little tired," said Lions' coach Jess Szymanski, whose team led only briefly twice in the first half. "We got nervous and wanted to do too much with the ball at the end. It's a learning experience."
Mount de Sales (2-1) led 44-36 heading into the final quarter, but the Sailors missed their first five shots as Dulaney trimmed the margin to 44-41 in the middle of the period on three free throws, the last two by Carly Glinowiecki.
Mount De Sales pushed its lead to 47-41 shortly thereafter on Eve Lukowski's three-pointer.
But Dulaney went on a 6-0 run and tied it with 1:58 left when Sharpe sank the second of two free throws.
Then, the Sailors went ahead 50-47 on three consecutive free throws. Amanda Donovan made one with 1:35 remaining and Lukowski converted two more with 15 seconds to go.
The Lions made one more run. After Glinowiecki made the first free throw to close the gap to a point, she rebounded the ball off her missed second attempt and fed it to Graves, who was off the mark with her shot.
Lukowski, a senior forward, led all scorers with 16 points and added three blocks and four steals. Junior forward Amanda Seidl had 10 points and nine rebounds. Bridget Williams and Annie Tavera contributed six points each.
Dulaney sophomore point guard Ellie Mathey scored 13 points, Graves chipped in 10 and Erin Briggs, Glinowiecki and Sharpe added seven apiece.