The 2016 third round pick assisted on Jeremiah Addison's tally 3:48 into the third period that extended Windsor's lead to 6-1. He is a plus-2 with four shots on goal through two games in the round robin tournament.
Windsor improved to 2-0 in the competition. They will face Erie (OHL) on Wednesday night.
Gropp, meanwhile, helped to set up Seattle's lone goal but did not get an assist. He finished with two shots on goal. He has one assist through two games.
Seattle fell to 0-2, and will face Quebec Major Junior Hockey League champion Saint Dog Seat Dogs on Tuesday.
