2008 Olympic Trials champion; 2005 World Outdoor champion; two-time USA Outdoor champion ('04, '05); 2004 Olympic silver medalist; 2004 World Indoor silver medalist; 2000 NAIA champion; two-time NAIA LJ champion.
Won the decathlon at the 2008 U.S. Olympic Trials with 8,832 points over two days, breaking the previous event record. Dan O'Brien finished with 8,726 points in 1996.
Clay ended the 2006 season ranked No. 1 in the world, becoming the first American to earn that distinction two years in a row since Dan O'Brien in 1995-96.
Despite nearly collapsing with low blood sugar after the 400m on Day 1 of the decathlon at the 2006 AT&T USA Outdoor Championships, Clay - the defending world champion - entered the second day of competition in the lead and was in first after seven events heading into the pole vault. But he still suffered from dizziness and weakness throughout the day, eventually withdrawing from the competition after failing to clear a height in the vault.
At the 2005 World Outdoor Championships in Helsinki, Finland, Clay delivered an amazing performance in atrocious conditions to win the gold medal with a world-leading 8,732 points. Won by a 211-point margin over reigning Olympic champion Roman Sebrle. Clay's performance provided the largest point differential between first and second places at a World Outdoor Championships since former world record holder O'Brien won gold for Team USA in 1995 with a victory margin of 206 points. Clay held a 222-point lead going into the javelin throw, when he his best throw of 72.00 meters/236 feet, 3 inches to add 920 points to his total. Clay set three individual event personal bests en route to winning the gold medal in Helsinki: 16.25m/53-3.75 in the shot put, 47.78 in the 400m and 72.00m/236-2 in the javelin.