02/05/2012 09:23 EST | Updated 04/06/2012 05:12 EDT

World Champ Kirani James runs year's fastest time to win men's 400 at Boston Indoor Grand Prix

BOSTON - World champion Kirani James of Grenada ran the fastest time this year to win the men's 400 metres Saturday at the New Balance Indoor Grand Prix.

James had a time of 45.96 seconds to edge out America's Josh Scott with 46.54 and Renny Quow of Trinidad with 46.70.

Maggie Vessey of the United States outstretched countrywoman Erica Moore at the tape to win the women's 800 metres by four one-thousandths of a second.

Vessey squeezed through on the inside edge of lane one and leaned over the finish line. She finished in 2 minutes, 2.361 seconds. Moore came in at 2:02.365, while Fantu Magiso of Ethiopia was third with 2:02.57.

Mo Farah of Britain, the reigning world champion at 5,000 metres and silver medallist in the 10,000, tripped on the first lap of the men's mile.

He got back up and into second place with three laps to go but he finished fourth, about 2 seconds behind Ireland's Ciaran O'Lionaird.

"I thought I was going to make it all the way," said Farah, a distance runner who rarely competes in the mile and still managed a personal best of 3:57.92. "But my legs just gave out."

In other events:

—Jenn Suhr won the women's pole vault with a height of 16 feet. She was not available for comment; meet organizers said she had a sore Achilles tendon but was still planning to compete in the Millrose Games in New York next week.

—World champion Kirani James of Grenada won the men's 400 metres in 45.96 seconds — the fastest in the world so far this year. American Josh Scott was second.

—Meseret Defar won the women's 3,000 metres, and fellow Ethiopian Tirunesh Dibaba won the women's 2 mile run.

—Caleb Ndiku of Kenya won the men's 3,000 metres by about one-half second over Ethiopia's Dejen Gebremeskel. Gebremeskel won the race last year despite losing his shoe near the start and running the rest of the race without it. America's Matthew Centrowitz was seventh and Andy Baddeley of Britain was eighth.

—America's David Oliver won the 60 metre hurdles in 7.60 seconds.