The world's most popular track & field athlete takes center stage tonight...

MOSCOW, Russia--It's an action packed evening Sunday as the second evening session begins in a few minutes at Luzhniki Stadium.

The world's most popular track athlete, Jamaica's Usain Bolt (left/photo by Paul Merca) begins and ends the session with the semis and finals in the men's 100, assuming of course, he gets through the semifinal round.

For American fans, Olympic champs Brittney Reese and Jenn Suhr go in the final of the women's long jump, and qualifying in the women's pole vault.

On the track, there are semis in the men's 800 and women's 400 with a strong presence by the red, white and blue.

In the women's 10000 finals, veteran Shalane Flanagan, along with the world championship debut of Oregon alum Jordan Hasay, will make the race interesting.

paulmerca.blogspot.com will have a recap of the day's activities later today.