His team won the national championship that year, wherein Bradman scored 7 goals and 1 assist, and was named the Most Outstanding Player.

[12] Bradman made his first official appearance with the U.S. Men's National Lacrosse Team during the Champions Challenge in Orlando, FL on January 26 and 27, 2013.

After participating in a controlled scrimmage against Notre Dame on the 26th, Bradman led team USA to a 17-13 victory over NCAA defending National Champion Loyola on the 27th by scoring three goals and two assists (3-2-5), for which he was named MVP of the game.

Team USA Head Coach Richie Meade was quoted as saying, "Sam had a chance to come out here and play, and he made the most of his opportunity.

[13] Bradman signed an endorsement deal with leading lacrosse manufacturer STX upon the completion of his senior season.