Watch the 3:40 mark above. Masters champion Adam Scott says he's "not single at all."
He's apparently back in his on-again-off-again relationship with Marie Kojzar ("Marie" as he calls her). Their relationship was outlined in this 2008 Sports Illustrated article.
He had previously dated tennis player Ana Ivanovic, and it was rumored that he was being pursued quite heavily by the producers of The Bachelor.