He was named the MLS Player of the Month for March after scoring five goals in his first three games in the league. He made his league debut on 5 March in a 2-1 home defeat against New York Red Bulls. On 2 February 2017, Martínez was loaned with a buying option to Major League Soccer expansion team Atlanta United. On 21 March, Atlanta announced they had activated the buyout clause for an undisclosed transfer fee. As Knoblauch warmed up between innings, he threw a ball 20 feet (6 meters) to the left of his first baseman that ricocheted off of the photographer’s booth.