Shawn Barber, Derek Drouin each win at Drake Relays

Canada's Shawn Barber and Derek Drouin each won gold at the Drake Relays Friday in Des Moines, Iowa.

Barber, the reigning world champion, won the men's pole vault in 18 feet-1/2 inches, while Derek Drouin took the men's high jump at 7-feet-4 1/4.

In other events,the defending Olympic 400-metre champion Kirani James broke the Drake Relays record with a world-leading time of 44.08 seconds Friday. James, who represents Grenada, beat American LaShawn Merritt by 0.14 seconds and shaved over a quarter of a second off the time he posted at a race in the Bahamas two weeks ago.

The performance only solidified James' status as the early favourite in the 400 for the Rio Olympics this August.

His time nearly matched the 43.94 he ran to win in London — and James still has three months to prepare for Brazil.

"It just shows I'm in great shape. But it also shows how competitive the field is, that a time like that was what it was going to take to win the majority of the races going forward this year," James said.

The time James posted was even more remarkable given the conditions, with temperatures hovering just below 50 degrees.

The conditions got to Merritt, the 2008 Beijing Olympics champion. He finished 2015 ranked second in the world and is hoping to be ready to push James by the Rio Games.

"I wanted to win the race. But I didn't want to kill myself," said Merritt, who matched the old meet record. "My toes felt frozen. So when I tried to like really push at certain parts, I felt like I was just tip-toeing. But I finished up healthy."

Bershawn "Batman" Jackson was something of a surprise winner of the 400 hurdles in 49.30.

It was a promising early run for Jackson, who is hoping to overcome personal tragedy and gain a measure of redemption after barely missing out on a spot on the U.S. team in the London Olympics four years ago.

Jackson lost his father to a heart attack in October, and he didn't even start training until late January. Jackson wore a necklace with some of his father's ashes in a small urn for the first time Friday, and he said he struggled with his emotions before the race because he knew his dad wasn't in the stands.

Jackson overcame a struggle on the ninth hurdle to beat Michael Tinsley, the silver medallist in London, in his outdoor season debut.

"This season right here, 2016, is going to define Batman's legacy," Jackson said. "Sometimes I defeat myself. But coming into this race, I didn't know where I was...I had mixed emotions. But one thing about me. I'm a competitor."

Two-time U.S. Olympian Jenny Simpson got her outdoor season off to a strong start, winning the women's 1,500 in 4:06.44.

Lorraine Ugen upset London Olympics champion Brittney Reese, winning at 22 feet, 4 1/2 inches.

Reese was fighting an injury to her left ankle that she had to tape up, but she didn't blame the setback on her performance. Reese's best jump fell three inches shy of Ugen's mark.

"Actually I wasn't disappointed. I was consistent the whole time," Reese said.

Tia Brooks won the women's shot put at 63-6 3/4, matching her personal best for the second straight meet.