Bershawn Jackson has roared back in 2015 after a tough couple of years. The American enters the Prefontaine Classic, winning all four of his 400m hurdles races so far this season, and will be eagerly awaiting tomorrow's test in Eugene.

Jackson, the world leader in the event, meets a field that is stacked with pedigree.

Johnnie Dutch is the second fastest man this year in the event, and Javier Culson will be looking to avenge his defeat to Jackson in Doha a few days ago.

It should be very close between those three, with Culson and Jackson both finishing ahead of each other on 13 occasions in their 26 meetings to date.

BERSAHWN JACKSON

Age: 32

Personal Best: 47.30 (2005)

Season Best: 48.09

Head-to-Head: 13

JAVIER CULSON

Age: 30

PersonalBest: 47.72(2010)

Season Best: 48.96

Head-to-Head: 13