Switzerland's rider Mat Rebeaud competes in the Red Bull X-Fighters World Tour finale at Battersea Power Station in London August 22, 2009. U.S. rider Nate Adams won the competition in the Freestyle Motocross (FMX) competition in front of a 17,000-strong crowd at the historic London landmark. REUTERS/Luke MacGregor (BRITAIN SPORT SOCIETY) 

Mat Rebeaud of Switzerland performs a trick during the FMX event at the Supercross in Geneva December 5, 2008. REUTERS/Denis Balibouse (SWITZERLAND) 

Mat Rebeaud of Switzerland puts the winner's trophy on his head after the Motorcycle Freestyle Motorcross (FMX) event at the Supercross in Geneva December 5, 2008. REUTERS/Denis Balibouse (SWITZERLAND) 

Mat Rebeaud of Switzerland performs a trick during the Motorcycle Freestyle Motorcross (FMX) event at the Supercross in Geneva December 5, 2008. REUTERS/Denis Balibouse (SWITZERLAND) 

Mat Rebeaud of Switzerland performs a trick during the Motorcycle Freestyle Motorcross (FMX) event at the Supercross in Geneva December 5, 2008. REUTERS/Denis Balibouse (SWITZERLAND) 

Mat Rebeaud of Switzerland performs a trick during the Motorcycle Freestyle Motorcross (FMX) event at the Supercross in Geneva December 5, 2008. REUTERS/Denis Balibouse (SWITZERLAND) 

EDITORIAL USE ONLY - NO COMMERCIAL OR BOOK SALES. Free styling motocross world champion Mat Rebeaud of Switzerland is airborne with his motorbike next to the ancient Acropolis during a bike show in Athens April 25, 2007. REUTERS/Yannis Behrakis (GREECE) 

EDITORIAL USE ONLY - NO COMMERCIAL OR BOOK SALES. Free styling motocross world champion Mat Rebeaud of Switzerland is airborne with his motorbike next to the ancient Acropolis during a bike show in Athens April 25, 2007. REUTERS/Yannis Behrakis (GREECE) 

EDITORIAL USE ONLY - NO COMMERCIAL OR BOOK SALES. Free styling motocross world champion Mat Rebeaud of Switzerland is airborne with his motorbike next to the ancient Acropolis during a bike show in Athens April 25, 2007. REUTERS/Yannis Behrakis (GREECE) 

EDITORIAL USE ONLY - NO COMMERCIAL OR BOOK SALES. Free styling motocross world champion Mat Rebeaud of Switzerland is airborne with his motorbike next to the ancient Acropolis during a bike show in Athens April 25, 2007. REUTERS/Yannis Behrakis (GREECE) 

EDITORIAL USE ONLY - NO COMMERCIAL OR BOOK SALES. Free styling motocross world champion Mat Rebeaud of Switzerland is airborne with his motorbike next to the ancient Acropolis during a bike show in Athens April 25, 2007. REUTERS/Yannis Behrakis (GREECE) 

EDITORIAL USE ONLY - NO COMMERCIAL OR BOOK SALES. Free styling motocross world champion Mat Rebeaud of Switzerland is airborne with his motorbike near the ancient Acropolis during a bike show in Athens April 25, 2007. REUTERS/Yannis Behrakis (GREECE) 

EDITORIAL USE ONLY - NO COMMERCIAL OR BOOK SALES. Free styling motocross world champion Mat Rebeaud of Switzerland goes airborne with his bike over a Jumbo jet 747 during a bike show as an airliner flies overhead the old airport of Athens April 24, 2007. REUTERS/Yannis Behrakis (GREECE) 

EDITORIAL USE ONLY - NO COMMERCIAL OR BOOK SALES. Free styling motocross world champion Mat Rebeaud of Switzerland performs with his bike on the wing of a Jumbo jet 747 during a bike show in the old airport of Athens April 24, 2007. REUTERS/Yannis Behrakis (GREECE) 

EDITORIAL USE ONLY - NO COMMERCIAL OR BOOK SALES. Free styling motocross world champion Mat Rebeaud of Switzerland (L) and his Belgian colleagues Jimmy Verburgh (C) and Gilles Dejong (R) perform with their bikes on the wing of a Jumbo jet 747 during a bike show in the old airport of Athens April 24, 2007. REUTERS/Yannis Behrakis (GREECE) 

EDITORIAL USE ONLY - NO COMMERCIAL OR BOOK SALES. Free styling motocross world champion Mat Rebeaud of Switzerland goes airborne next to an out of service Jumbo jet 747 during a bike show in the old airport of Athens April 24, 2007. REUTERS/Yannis Behrakis (GREECE) 

EDITORIAL USE ONLY - NO COMMERCIAL OR BOOK SALES. Free styling motocross world champion Mat Rebeaud of Switzerland jumps next to an out of service Jumbo jet 747 during a bike show in the old airport of Athens April 24, 2007. REUTERS/Yannis Behrakis (GREECE) 

EDITORIAL USE ONLY - NO COMMERCIAL OR BOOK SALES. Free styling motocross world champion Mat Rebeaud of Switzerland jumps next to an out of service Jumbo jet 747 during a bike show in the old airport of Athens April 24, 2007. REUTERS/Yannis Behrakis (GREECE) 

EDITORIAL USE ONLY - NO COMMERCIAL OR BOOK SALES. Free styling motocross world champion Mat Rebeaud of Switzerland jumps next to an out of service Jumbo jet 747 during a bike show in the old airport of Athens April 24, 2007. REUTERS/Yannis Behrakis (GREECE) 

EDITORIAL USE ONLY - NO COMMERCIAL OR BOOK SALES. Free styling motocross world champion Mat Rebeaud of Switzerland jumps next to an out of service Jumbo jet 747 during a bike show in the old airport of Athens April 24, 2007. REUTERS/Yannis Behrakis (GREECE) 

Mat Rebeaud of Switzerland performs on his motorcycle during the freestyle motocross show "Red Bull X Fighters" in the Mexico City's bull ring, March 31, 2006. REUTERS/Henry Romero 

Swiss Mat Rebeaud performs a stunt in the air with his motorcycle during a freestyle motorcross demonstration in Rotterdam, the Netherlands, October 9, 2005. REUTERS/Michael Kooren