Duke improves to 6-3 on the year while the Big Green falls to 2-2. The Blue Devils have now won all 15 meetings with Dartmouth.
"I was really pleased with our focus and our approach today," head coach John Danowski said. "I do believe that maybe we're getting better. That's the hope and I'm just delighted with their focus and unselfishness today. A lot of guys are not getting points, but plays are being made because they are moving the ball to the next open guy. It was really fun to be a part of."
Spearheaded by three goals from Dionne, Duke broke open a 1-1 contest with an 8-1 run that gave the Blue Devils a 9-2 lead midway through the second quarter when Rotanz netted a goal from Justin Turri. The Blue Devils held a 10-3 lead at halftime, and then scored nine markers in the third period - including two apiece by Rotanz, Wolf and Christian Walsh - to claim a 19-6 advantage after three quarters.
"We needed this week to get better," Rotanz said. "And to come out and see our hard work in practice pay off is great. We really needed this win."
"In the beginning we were kind of feeling them out a little bit and being patient," Rotanz said. "Once we realized what their weaknesses were we attacked the backside and it was a case of making the simple easy pass."
Wolf chipped in three assists for a game-best seven points while Turri logged two goals and a career-high four assists for a career-best six points. Walsh finished the day with two goals and two assists.
Duke won the faceoff battle by claiming 20-of-33 draws. Brendan Fowler, who scored one goal and added an assist, led the way for the Blue Devils, securing 10-of-16 draws.
In the Duke goal, Dan Wigrizer earned the start and was credited with eight saves against just three goals against in 30 minutes of work. Reserves Mike Rock (15 minutes; 4 saves; 3 goals against), Kyle Turri (9:09 minutes; 0 saves; 3 goals against) and Chris Shannon (5:51 minutes; 3 saves; 0 goals against) closed out the victory.
For Dartmouth, Adam Hull and Colin Delaney tallied two goals each while Drew Tunney recorded a team-best four total points on one goal and three helpers. Fergus Campbell worked 37:18 between the pipes and made five saves while allowing 14 goals.
Led by CJ Costabile's game-high 10 grounders, the Blue Devils held the final edge in ground balls, 37-27, while both squads converted three-of-four extra man opportunities.
Duke travels to Washington, D.C., to meet Georgetown this Saturday. Faceoff is set for 12 noon and the game will be streamed live on ESPN3.com.