Dibaba, silver medallist at the Olympic Games in Rio de Janeiro, came into the Copernicus Cup event in fine form having set a world record earlier this week and lived up to her billing by clocking 3min 58.50sec at the Indoor Arena.

The 26-year-old led home an Ethiopian one-two as Axumawit Embaye finished second, with Meraf Bahta of Sweden coming through to take third.

"I’m happy with the result today but the pacing wasn't quite right," said Dibaba, who turned 26 just two days ago. 

"I tried very hard over the last two laps but I wasn't quite able to do it."

Dibaba's time was one of five world leading efforts recorded in front of a capacity crowd of 5,200 in Torun today.

Joanna Jozwik delighted the home support inside the venue as she set a national record in the 800m, completing two laps of the track in 1:59.29.

Her performance marked the first time an athlete had gone under the two-minute mark this season.

Aníta Hinriksdóttir of Iceland was second behind the Polish runner, while Belarusian Maryna Arzamasova, the current world champion, had to settle for third.

Ronnie Baker of the United States secured his maiden international indoor victory in style as he won the men's 60m in a quick-fire 6.46sec, the 12th best indoor time ever in the distance.

It was also the quickest 60m race from an American athlete for five years and saw him climb to seventh on the US all-time list.

Chijindu Ujah of Great Britain was a distant second in 6.56, with Ghanaian Sean Safo-Antwi crossing the line in third.

The women's 60m race proved to be a thriller as world indoor champion Barbara Pierre of the US edged Ezinne Okparaebo of Norway by two thousandths of a second.

Pierre, who clocked a world leading 7.11 in the heats, crossed the line almost at the same time as the Norwegian but was eventually given the victory in 7.13.

Jamaica's Gayon Evans came home in third spot.

Bralon Taplin of Granada sprung one of the biggest surprises of the night as he won the men's 400m in a world leading 45.59.

Taplin kept pace with two-time world indoor champion Pavel Maslák before he surged away down the final stretch to cross the line in front of the Czech competitor, with Luguelín Santos of the Dominican Republic closely behind in third.

Olympic silver medallist Orlando Ortega cruised to a Spanish record of 7.48 to win the men's 60m hurdles in front of Konstadinos Douvalidis of Greece and Spain's Yidiel Contreras, second and third respectively.

Nichole Buchler of Switzerland produced the highlight in the field, securing a superb triumph in the women's pole vault.

Buchler needed just two efforts and was successful at both, 4.50 metres followed by 4.60m, to wrap up victory.

Czech Romana Malacova and Mary Saxer of the US could not get past the 4.50m mark.

The event in Torun was the penultimate meeting of the IAAF World Indoor Tour.

The series is due to conclude in Birmingham in Britain next Saturday (February 18).