As a key face off man for Denver, Kelly won 87–149 face offs in 5 games, with a face off win percentage of 58.4%. He helped the Outlaws advance to the MLL Championship to play for the Steinfeld Cup, where they were eventually defeated by the Chesapeake Bayhawks. Kelly returned with the Outlaws in 2013 and helped them to the first perfect regular season in MLL history. The Outlaws went 14–0 as Anthony won 195 face offs, picked up 59 ground balls, and scored 5 goals. Kelly played 12 games with the Outlaws in 2014 and collected a career high 63 ground ball pickups, despite missing the last two games of the regular season due to injury. He won a total of 159-303 faceoffs in the 2014 regular season and went 14–25 in the final playoff game to help the Outlaws win the 2014 MLL Championship. 2015 was another great year for Kelly as he won 169-298 (56.7%) face offs for the Denver.