Kirsty Coventry of Zimbabwe set a new world record in the 100 back semifinal with a time of 58.77. Japan’s Kosuke Kitajima became the first man under 59 seconds in the 100 breaststroke with a time of 58.91. And Eamon Sullivan led off Australia’s 4×100 freestyle relay with a 100 free world record time of 47.24, in a blistering race where 5 teams went under the 4×100 world record mark from yesterday, and USA just barely overtook France at the finish to claim the gold and world record time of 3:08.24.

Sources: SwimInfo here, here and here

Both 400 IM world records were bettered at the 2008 Olympics yesterday, when first USA’s Michael Phelps swam 4:03.84, smashing his own world record of 4:05.25 from the U.S. Olympic Trials, and Australia’s Stephanie Rice swam 4:29.45, more than half a second faster than the 4:31.12 of Katie Hoff from the U.S. Trials.

Sources: SwimInfo here and here

On July 5th, Margaret Hoelzer set a new 200 meter backstroke world record with the time of 2:06.09, beating Kirsty Coventry’s world standard of 2:06.39 from February.

Source: SwimInfo

On July 4th, Aaron Piersol tied Ryan Lochte’s 200 backstroke world record, and Phelps set a new 200 IM world record in the time of 1:54.80. Lochte swam 1:54.34 in the 200 backstroke, and 1:55.22 in the 200 IM (third fastest time in history).

Source: SwimInfo here and here

The agency is studying Viagra’s effects in athletes, but hasn’t yet banned it. Viagra is not on the International Olympic Committee’s list of prohibited drugs, so athletes can take it at the Beijing Olympics.

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First Hayley McGregory bettered the 100 Backstroke of Natalie Coughlin with a 59.15 (Coughlin’s WR was 59.21), and then Coughlin took it back in the next heat with a 59.03.

Couchlin’s own comments after the swim