YOKOHAMA (Japan), Aug 28: Ian Thorpe remained unconquered while the gold medals continued flowing for the United States at the Pan Pacific Swimming Championships Wednesday.

The Australian colossus racked up his fifth gold medal, this time in the 100-metres freestyle in close to his best time, while the Americans mopped up a team victory over the Australians with one day’s competition left.

The triple world record holder captured the gold medal in 48.84 seconds in a one-two Australian finish with Ashley Callus second and American Nate Dusing third.

But it was another night where the United States underlined their supremacy in the Yokohama pool with victories in four of the five finals.

Aaron Peirsol cleaned up the backstroke double with a convincing triumph in the 100m event in 1:56.88, Diana Munz won the 800m freestyle, Amanda Beard completed the breaststroke double winning the 200m final and the Americans won the women’s 4x200m freestyle relay.

The United States with 16 gold medals lead Australia by seven with only seven finals left on Thursday’s final night.

Yet it was 19-year-old Thorpe who headlined the penultimate night’s swimming with his clear-cut victory over compatriot Callus and Dusing.

The triple world record holder added the 100m crown to his earlier successes in the 200m and 400m freestyle and the 4x100m and 4x200m freestyle relays.

Wednesday’s win continued an extraordinary run of success for the Australian sensation in major swimming meets.

Thorpe’s best time in the 100m is 48.73 in winning the gold medal at this month’s Manchester Commonwealth Games. Dutchman Pieter van den Hoogenband’s holds the world record mark of 47.84.

Aaron Peirsol admitted he was trying to go under his world record in the 200m backstroke final.

Peirsol, who holds the mark at 1:55.15 from last March, hit the wall at 1:56.88 and was almost a second faster than Australian runnerup Matt Welsh.

Diana Munz won the freestyle treble with her victory in the 800m to go with her earlier wins in the 400m and 1,500m.

Munz clocked 8:30.45 to beat Japan’s Sachiko Yamada and teammate Hayley Peirsol.

She later teamed with Natalie Coughlin, Mary Hill and Lindsay Benko to down Australia in the 4x200m freestyle relay in 7:56.96.

Amanda Beard out-touched Australia’s Leisel Jones to win the 200m breaststroke in 2:26.31.

Results of finals:

MEN’S

100 metres freestyle: 1. Ian Thorpe (Australia) 48.84 seconds; 2. Ashley Callus (Australia) 49.26; 3. Nate Dusing (US) 49.47; 4. Brent Hayden (Canada) 49.53; 5. Scott Tucker (US) 49.56; 6. Yannick Lupien (Canada) 49.99; 7. Daisuke Hosokawa (Japan) 50.71; 8. Yoshihiro Okumura (Japan) 50.73.

200 metres backstroke: 1. Aaron Peirsol (US) 1:56.88; 2. Matthew Welsh (Australia) 1:57.69; 3. Keith Beavers (Canada) 1:59.35; 4. Takashi Nakano (Japan) 2:00.08; 5. Leigh McBean (Australia) 2:00.50; 6. Raymond Hunt (US) 2:00.79; 7. Naoya Sonoda (Japan) 2:00.93; 8. Rui Yu (China) 2:01.56.

WOMEN’S:

800 metres freestyle: 1. Diana Munz (US) 8 minutes 30.45 seconds; 2. Sachiko Yamada (Japan) 8:31.89; 3. Hayley Peirsol (US) 8:32.27; 4. Ai Shibata (Japan) 8:38.30; 5. Amanda Pascoe (Australia) 8:39.89; 6. Nayara Ledoux Ribeiro (Brazil) 8:43.53; 7. Jennifer Reilly (Australia) 8:44.92; 8. Taryn Lencoe (Canada) 8:51.00.

200 metres breaststroke: 1. Amanda Beard (US) 2:26.31; 2. Leisel Jones (Australia) 2:26.42; 3. Kristy Kowal (US) 2:27.59; 4. Xuejuan Luo (China) 2:28.23; 5. Junko Isoda (Japan) 2:29.30; 6. Fumiko Kawanabe (Japan) 2:30.80; 7. Brooke Hanson (Australia) 2:31.22; 8. Rhiannon Leier (Canada) 2:32.64.

4x200 metres freestyle relay: 1. United States 7:56.96 (Natalie Coughlin, Mary Hill, Diana Munz, Lindsay Benko); 2. Australia 7:59.25 (Petria Thomas, Elka Graham, Giaan Rooney, Alice Mills); 3. Japan 8:04.01 (Tomoko Nagai, Sachiko Yamada, Norie Urabe, Maki Mita); 4. Canada 8:11.16; 5. Brazil 8:15.80; 6. New Zealand 8:17.39; 7. Hong Kong 8:43.10; 8. Singapore did not start.—Reuters