Broomfield headed in a pass from David Styles about six minutes after Robert Morris opened the scoring. Miro Cabrilo set up Brett Neco for the first goal, which came 20:32 into the match.
Mateo Munarriz made two saves for the Hawks, who welcomed 310 fans for the game. Joseph Kuta stopped one shot for Robert Morris (0-1-1).
The Hawks (0-1-2) play previously ranked Cornell in the final round of the Mayor’s Cup at 3 p.m. Sunday. Robert Morris closes tournament play against University of Detroit Mercy at noon Sunday.