On September 28, 2007, Buchanan, who uses the name 'buck21' on PokerStars, won event #19 of the 2007 World Championship of Online Poker, a $530 buyin Pot-limit Omaha tournament.
James Buchanan | Buchanan | Shawn Mullins | Jack Buchanan | Shawn Fanning | Shawn Colvin | Shawn Ashmore | Edgar Buchanan | Shawn Estes | George Buchanan | Roy Buchanan | Francis Buchanan-Hamilton | Fort Buchanan | Wallace Shawn | Shawn Pyfrom | Shawn Pelton | John Buchanan | Buchanan, Wisconsin | Buchanan Rides Alone | Buchanan County, Virginia | Barry Buchanan | Anthony Buchanan | Shawn Michaels | Shawn Levy | Shawn Lee | Shawn Kelly | Robert Buchanan | Neil Buchanan | Mary Beth Buchanan | Keisha Buchanan |
His first WSOP in the money finish was the first place finish in the 593-player 8-handed €10,400 October 15 – 20, 2011 WSOPE Main Event Championship for a prize of €1,400,000 ($1,927,660) over a final table that included Jake Cody, Chris Moorman and Shawn Buchanan.