 In March 2013, Khalifa won the United States Intercollegiate Individual Squash Championships by defeating senior Todd Harrity from Princeton University in the final match 3 games to 0, at Trinity College in Hartford, Connecticut.In the semi-final match Khalifa beat Ali Farag from Harvard in a tight 3-2 match.Khalifa was awarded the Player of the Year award during the 2013 St. Lawrence University Squash Banquet and featured in Sports Illustrated "Faces in the Crowd".