The Detroit Pistons traded veteran forward Isaiah Stewart to the Memphis Grizzlies in an apparent cost-saving move that sends three future second-round picks to Detroit. Stewart, a Rochester native who played at Washington under former Syracuse assistant Mike Hopkins, had been Detroit’s longest-tenured player. The Pistons are coming off a breakthrough season in which they finished with a 60-22 record before losing to the Cleveland Cavaliers in Game 7 of the Eastern Conference Semifinals.