From 2002 he competed professionally, mostly on the doubles circuit. He reached a highest doubles ranking of 173 in the world and won a total of 12 ITF Futures titles. Both on his ATP Challenger titles were also in doubles, the Tampere Open with Doug Bohaboy in 2002 and the Burbank Challenger partnering Brian Wilson in 2004. It was with Wilson that he made his only main draw appearance on the ATP Tour, at the 2005 China Open. They were beaten in the first round of the Beijing tournament by eventual semi-finalists Lars Burgsmüller and Lee Hyung-taik in a close three-set match that was decided by a tie-break.[5]
Rainey has also been a professional poker player.[6][7] In 2011 it was reported that he had allegedly sold shares for his entry into a World Series of Poker main event which he never registered for and then failed to return the money to his backers.[8][9]