The 24-year-old (born Oct. 2, 1992) 6-2, 213-pound native of Park Ridge, Illinois appeared in 48 regular-season games this past season with the AHL Ontario Reign, recording 33 points (16-17=33) and 46 penalty minutes.
He missed half of January and all of February with a knee injury. He also appeared in all five postseason games for the Reign, registering three points (0-3=3). He tied for the team-lead in assists and tied for third on the team in points.
A fourth-round (110th overall) selection of the Kings in the 2011 NHL Entry Draft, Mersch has appeared in 183 regular-season AHL games, posting 124 points (64-60=124), a plus-37 rating and 99 penalty minutes.
He has also played in 40 postseason games, recording 32 points (15-17=32), a plus-14 rating and 14 penalty minutes.
During Manchester's 2015 Calder Cup championship run, Mersch tied for the league-lead in points and ranked second in the league in goals (first among rookies).
Mersch also made his NHL debut during the 2015-16 season with the Kings, posting three points (1-2=3) in 17 games.