As in three of the previous four years' 'favorites' albums, there's a Brazilian Jiu-Jitsu photo in this year's album. This photo - from the 2013 World Championships - shows Woolf Barnato (Ralph Gracie Jiu-Jitsu, San Francisco) submitting an opponent (with a choke), en route to winning the purple belt light-feather division.
(May 31, 2013. Nikon D5000, 1/250s @ f/5.6, 270mm, ISO 2500.)