Michael Norman improves the world indoor 400m record, while three teams dip below recently-set men’s world 4x400m mark and Tim Duckworth betters his own British heptathlon record

There was an incredible series of performances on the second day of the NCAA Indoor Championships at College Station, Texas, on Saturday.

World under-20 200m champion Michael Norman stormed to victory in the 400m, clocking 44.52 in only his third ever race indoors over the distance to improve the previous record set by Kerron Clement in 2005 by 0.05.

The University of Southern California student-athlete had run a 200m split of 21.33 and eventually claimed the title ahead of Akeem Bloomfield who had set a Jamaican indoor record of 44.86 in the first race of the two-heat final.

In the men’s 4x400m, the top three teams all dipped inside the recent world indoor record mark set by Poland at the IAAF World Indoor Championships in Birmingham (3:01.77), led by a University of Southern California team anchored by Norman.

The winning team clocked 3:00.77 ahead of Texas A&M with 3:01.39 and Florida with 3:01.43.

Zach Shinnick, Rai Benjamin and Ricky Morgan Jr. joined Norman in that winning team and their time will be a world best, as Benjamin is from Antigua & Barbuda, while his team-mates are USA athletes. Therefore, the world record would be held by the Texas A&M team, with the mark – like Norman’s 400m – now pending ratification.

Kendall Ellis won the women’s 400m in a North American indoor record of 50.34, before Sydney McLaughlin won the second heat of the two-race final in a world under-20 record of 50.36.

There was a North American indoor 200m record of 20.02 by Elijah Hall, while Gabrielle Thomas won the women’s race in a collegiate record of 22.38. Hall also claimed the men’s 60m title in 6.52 and Aleia Hobbs the women’s in 7.07 to equal the collegiate record.

Tim Duckworth became the first British athlete to win an NCAA combined events title, either indoors or outdoors, as he won the heptathlon with a total of 6188 points to improve his own national record.

The Kentucky student-athlete ran 6.84 in the 60m, long jumped 7.74m, threw 13.59m in the shot put, cleared 2.17m in the high jump, clocked 8.23 in the 60m hurdles, cleared 5.16m in the pole vault and ran 2:56.23 for 1000m.

His fellow Brit Josh Kerr of the University of New Mexico retained his mile title, clocking 3:57.02.

Siofra Cleirigh Buttner broke the Irish indoor 800m record with 2:02.46 to finish second behind Sabrina Southerland with 2:01.55.

Florida’s men and Georgia’s women won the team titles.

Grant Holloway contributed to that Florida team win as he won the 60m hurdles on Saturday in 7.47 and the day before leapt 8.13m for second place in the long jump behind Will Williams with 8.19m. Holloway also ran a leg of 44.91 in the 4x400m.

Among Georgia’s winners was Keturah Orji as she set a championship record of 14.27m to win the triple jump and also finished second in the long jump with 6.52m behind her team-mate Kate Hall with 6.73m and ahead of Tara Davis, also a University of Georgia athlete, with 6.50m.

On Friday, Davis also broke the world under-20 indoor 60m hurdles record with 7.98 to win her heat.

Full results can be found here.