 Molloy signed as a free agent with the Buffalo Sabres in February 1990 and was assigned to the American Hockey League to play for the Sabres' affiliate the Rochester Americans.He got called up from Rochester and made his NHL debut in a game against the Calgary Flames on March 21, 1990 at the Buffalo Memorial Auditorium where he would fight NHL veteran Tim Hunter.He played his second and final game in the NHL on April 1, 1990 in the Sabres' last game of the regular season against the Quebec Nordiques, getting into another fight with rookie enforcer Brent Severyn.