Another Olympic record on opening night, just not by Hansen

Brendan Hansen entered the prelims of the 100-meter breaststroke as the world and Olympic record holder, but he'll only have his world mark to protect when he swims again in the semifinals, as Norway's Alexander Dale Oen clocked 59.41 seconds to become the first man to swim under 1 minute at the Olympic Games.

Hansen's 59.13 from the 2006 ConocoPhillips Summer National Championships in Irvine still remains the global standard, but Dale Oen's mark surpassed Hansen's mark of 1:00.01 from Athens in 2004 and moved him into fifth all-time on the event performance list, just ahead of 200 breaststroke world-record holder Kosuke Kitajima of Japan, who clocked a personal-best 59.44 in March.

Kitajima produced the second-fastest qualifying mark of 59.52 and three other swimmers -- Hugues Duboscq of France (59.67), Brenton Rickard of Australia (59.89) and Cameron van der Burgh of South Africa (59.96) -- all eclipsed the 1-minute barrier.

Hansen tied for 10th with Australia's Christian Sprenger at 1:00.36.