MANCHESTER, England – Jennifer Carroll of Montreal posted her first career sub one minute time in the women’s 100-metre backstroke on Wednesday to open the world short course swimming championships. The opening day featured three world record performances.

Kirsty Coventry of Zimbabwe broke the women’s 400 metres individual medley world record clocking 4:26.52 seconds to beat the time of 4:27.83 set by Yana Klochkova of Ukraine in 2002.

The U.S., broke the men’s 4×100 metres freestyle relay record clocking three minutes 8.44 seconds to beat the 3:09.57 mark set by Sweden at the 2000 short course worlds.

The Netherlands set a world short-course record for the women’s 4×200 metres freestyle relay clocking seven minutes and 38.90 seconds to beat the 7:46.30 mark set by Russia at the 2002 worlds in Moscow.

In the women’s 100 backstroke, Carroll clocked a personal best 59.86 seconds in the semifinal to finish 15th overall. The time augurs well for Carroll later this week in for her best event, the 50 backstroke, in which she won the world short course title in 2004.

Hanna Kubas of Calgary was 22nd in the same event.

Callum Ng of Vancouver reached the men’s 100 backstroke semifinals and placed 15th.

Competition continues Thursday.