What you should know at this stage of the World Track and Field Championships (all times ET), particularly if you’re waking up in a couple of hours:

– Usain Bolt races in the men’s 100 semifinals at 5:30 a.m. ET and almost certainly the final at 7:45 a.m.

– Americans Trey Hardee and Ashton Eaton are currently 1-2 in the decathlon, which wraps with the 1,500 meters at 7:15 a.m.

– Kenyans won all six medals on Day 1 (women’s 10,000 and marathon).

– Russia then claimed second in the medal table with gold and silver in the men’s 20k walk.

– Britain, hoping for a lot of medals next year on home soil, got a rough start — a false start, actually, with Olympic champion Christine Ohuruogu disqualified in the 400 heats.

– Some clutch qualifications for U.S. women in field events — Brittney Reese posted the best jump of Group A on her final attempt, and Jenn Suhr needed a third attempt at 4.50 meters before making the grade in the pole vault.

– Sogelau Tuvalu set a personal best in the 100 meters — 15.66 seconds.