STOCKHOLM, Nov 13: American swimmer Peter Marshall achieved his second short-course world record in two days at the World Cup on Wednesday.

Sweden’s Therese Alshammar also set a new record in the women’s 50-meter butterfly in 25.31 seconds, topping the 25.32 by Australia’s Felicity Galvez at the world short-course championships last April.

Marshall won the 50 backstroke in 23.05 seconds, beating Australian Robert Hurley’s mark of 23.24 set at the Sydney World Cup last month. Another American, Randall Bal, also went under Hurley’s time for second place at 23.07. Hurley was third in 23.36.

“I feel great. I have never had multiple world records in a meet so this is great,” Marshall told Swedish television.

After watching a replay of his race, he said, “I had a couple of things to brush up on so maybe I can do it again in the next meet, who knows?”

On Tuesday, Marshall regained the 100 backstroke record in 49.94 seconds, breaking countryman Ryan Lochte’s 2006 time of 49.99. Lochte took the record from Marshall.

Alshammar was surprised by her world record.

“I’m still shocked and haven’t realized it yet,” she said. “It’s incredible.”

The seventh and last World Cup of the year is at Berlin starting on Saturday.

Wednesday’s results:

Women’s:

100 metres freestyle: 1. Hanna-Maria Seppala (Finland) 52.44 seconds; 2. Josefin Lillhage (Sweden) 52.79; 3. Jeanette Ottesen (Denmark) 52.86.

400 metres freestyle: 1. Lotte Friis (Denmark) four minutes 02.64 seconds;

2. Melissa Ingram (New Zealand) 4:03.77; 3. Sasha Matthews (Britain) 4:05.74.

100 metres backstroke: 1. Fabiola Molina (Brazil) 58.67 seconds; 2. Anastasia Zueva (Russia) 58.72; 3. Sophie Edington (Britain) 59.17.

50 metres breaststroke: 1. Sarah Katsoulis (Australia) 30.37; 2. Tara Kirk (US) 30.44; 3. Katja Lehtonen (Finland) 30.96.

200 metres breaststroke: 1. Katheryn Meaklim (South Africa) two minutes 22.07 seconds; 2. Joline Hostman (Sweden) 2:23.52; 3. Alena Alekseeva (Russia) 2:23.57.

50 metres butterfly: 1. Therese Alshammar (Sweden) 25.31 seconds (world record); 2. Mareike Guehrer (Australia) 25.37; 3. Jeanette Ottesen (Denmark) 25.41.

200 metres butterfly: 1. Petra Granlund (Sweden) two minutes 06.44 seconds; 2. Amy Smith (Australia) 2:06.58; 3. Amanda Loots (South Africa) 2:07.36.

100 metres medley: 1. Hanna-Maria Seppala (Finland) 50.07 seconds; 2. Hanna Eriksson (Sweden) 1:01.05; 3. Sophie Edington (Australia) 1:01.43.

400 metres medley: 1. Katheryn Meaklim (South Africa) four minutes 27.21 seconds; 2. Emma Smithurst (Britain) 4:35.29; 3. Joanna Maranhao-Melo (Brazil) 4:35.62.

Men’s:

50 metres freestyle: 1. Frederick Bousquet (France) 20.97 seconds; 2. Stefan Nystrand (Sweden) 21.18; 3. Nicholas Brunelli (US) 21.22.

200 metres freestyle: 1. Oussama Mellouli (Tunisia) one minute 42.86 seconds; 2. Paul Biedermann (Germany) 1:43.46; 3. Darian Townsend (South Africa) 1:43.55

1500 metres freestyle: 1. Mads Glaesner (Denmark) 14 minutes 38.87 seconds; 2. Pal Joensen (Faroe Island) 14:48.89; 3. Daniel Fogg (Britain) 15:13.70

50 metres backstroke: 1. Peter Marshall (US) 23.05 seconds (world record); 2. Randall Bal (US) 23.07; 3. Robert Hurley (Australia) 23.36.

200 metres backstroke: 1. Ryosuke Irie (Japan) one minute 51.71 seconds; 2. Aschwin Wildeboer (Spain) 1:52.33; 3. Robert Hurley (Australia) 1:52.92.

100 metres breaststroke: 1. Cameron van der Burgh (South Africa) 57.06 seconds; 2. Igor Borysik (Ukraine) 57.77;

3. Vladislav Polyakov (Kazakhstan)

58.22.

100 metres butterfly: 1. Evgeny Korotyshkin (Russia) 50.22 seconds; 2. Matthew Jaukovic (Australia) 50.31; 3. Nikolay Skvortsov (Russia) 50.84.

200 metres medley: 1. Darian Townsend (South Africa) one minute 54.96 seconds; 1. Oussama Mellouli (Tunisia) 1:54.96; 3. Vytautas Janusaitis (Lithuania) 1:55.48.

—Agencies