The Islanders selected Mayfield in the second round (34th overall) of the 2011 NHL Draft. In 428 regular-season games with the Islanders, he's scored 111 points (25 goals, 86 assists). Over the past three seasons, he has led the Islanders in shorthanded time-on-ice, averaging 2:28 per game. Mayfield also has 16 points (four goals, 12 assists) in 57 career playoff games. He played 223 American Hockey League games with the Islanders' American Hockey League affiliate in Bridgeport, totaling 12 goals, 38 assists and 411 penalty minutes.