Bernard Lagat

Men's and women's steeplechase and 5,000-meter prelims also got underway on Monday night.

They are documenting their feeling in the lead-up to the races.

Lauren Kleppin won the women's race.

The two-time Olympic medalist might be in for his toughest challenge yet.

The Kenyan-born American will racing shorter distances until then.

The men's 1500m race will be especially exciting.

He defeated Mo Farah and a group of Kenyans.

2010 world indoor champion Bernard Lagat leads men's squad.

He defeated rival Galen Rupp.

Matt Centrowitz wins Wannamaker Mile.

He'll have his hands full with training partner Lawi Lalang.

His coach says he's got the pacemaker to do it.