2009-10: Scott Mayfield was initially drafted by the Indiana Ice of the USHL but was immediately traded to the Youngstown Phantoms where in 59 games he posted 10 goals, 12 assists, and 145 penalty minutes. His play garnered enough attention for him to receive an invitation to the NHL Research, Development and Orientation camp where he opened up a lot of eyes.
2010-11: After starting his second season in Youngstown, Mayfield was invited to the World Junior-A Challenge where after posting an assist in four games and shutting down the opposition with aplomb, he would receive Tournament MVP honors. In 52 games for the Phantoms, Mayfield scored 7 goals and added 9 assists for 16 points while adding 159 penalty minutes.
2011-12: Mayfield stepped into a first-pairing defense role for the University of Denver as a freshman; skating alongside junior Paul Phillips for the Pioneers. In 42 games he scored 3 goals with 9 assists and was plus-five with a team-high 76 penalty minutes. Denver finished third in the WCHA and earned an NCAA tournament bid after reaching the WCHA championship game against North Dakota.
2012-13: Mayfield signed a three-year entry-level contract with the Islanders and made his pro hockey debut with New York AHL affiliate Bridgeport in April 2013 following his sophomore season at Denver. He had no points and was +1 with 2 penalty minutes in six AHL games. The Sound Tigers missed the playoffs after finishing third in the Northeast Division. Mayfield skated in all 39 games for Denver in his final season of college hockey. He scored 4 goals with 13 assists and was +8 with a team-high 112 penalty minutes. The Pioneers finished in a three-way tie for fourth in the WCHA, receiving an at-large bid to the NCAA tournament despite a first round loss to Colorado College in the WCHA tournament, and lost to New Hampshire in the Northeast Regional.
2013-14: Mayfield made his NHL debut with the Islanders on April 6th in a game against Columbus and played five late season games with New York — spending most of his first pro season with Islanders AHL affiliate Bridgeport. He had no points and was minus-3 with 7 penalty minutes while averaging 17:22 minutes of ice time for the Islanders. One of four Bridgeport defensemen with 18 or more points, he scored 3 goals with 15 assists in 71 games and had an even plus/minus while leading Sound Tigers’ defensemen with 129 penalty minutes. Bridgeport finished fifth in the Northeast Division; missing the AHL playoffs.
2014-15: Mayfield appeared in two NHL playoff games for the Islanders after spending the season with AHL affiliate Bridgeport. He was -1 with no points nor penalties, averaging 12:25 minutes of ice time in two games in New York’s series against the Capitals. Mayfield scored 1 goal with 13 assists and was -12 in 69 games for the Sound Tigers. His 173 penalty minutes were second only to veteran enforcer Brett Gallant (247) for Bridgeport, which missed the AHL playoffs after finishing last in the Northeast Division.
Mayfield is very much a prototypical NHL defenseman — a big man who is a strong skater and possesses a natural feel for the ice and the puck. A free-wheeling defenseman in junior hockey, he still has a willingness to join the play but has a physical bite to his game. Offensively, he has a booming point shot and underrated hands when getting in closer to the net. One of the more consistent and durable defensemen in the Islanders' system, Mayfield does not have the flash and sizzle of some of the other young defensemen but appears equally capable of being a reliable blueliner at the NHL level one day.
Mayfield attended his third training camp with the Islanders before being assigned to AHL affiliate Bridgeport to start the 2015-16 season. He was briefly recalled in January and skated in three games with New York before being returned to the Sound Tigers. In the third year of his original three-year contract, Mayfield has seen time in the NHL in each of his those seasons. He does not have some of the high end skills of some of the other Islanders' defense prospects but his combination of toughness and steady play in his own end make him valuable in a lower line role and a dependable call up option.