IAAF World Championships on the BBC

Venue: Beijing National Stadium Dates: 22-30 August

Coverage: Live on BBC TV, Red Button, Radio 5 live, online, mobiles, tablets and app.

Britain's Olympic champion Jessica Ennis-Hill leads the World Championship heptathlon after two events with Katarina Johnson-Thompson second after a dramatic morning in the Bird's Nest.

Ennis-Hill matched her season's best with 1.86m in the high jump, having run 12.91 seconds in the 100m hurdles as she attempts to win back her world title after giving birth to son Reggie.

Fellow Briton Johnson-Thompson, who has jumped 1.97m indoors this year, salvaged 1.89m from the high jump despite struggling with her run-up.

Gold medal favourite Brianne Theisen-Eaton produced a personal best of 12.98secs in the hurdles, but managed only 1.80m in the high jump, well down on her best, to slip back to fifth, 87 points behind Ennis-Hill.

Johnson-Thompson needed three attempts to get over her opening height of 1.80m having hit the uprights with her head on her second attempt, and a third failure would have ended the 22-year-old's medal hopes.

But she found a semblance of rhythm to back up a personal best of 13.37secs in the 100m hurdles, and with the shot put and javelin to come in Saturday's evening session, remains in the hunt for her first senior medal at a global level.

Nineteen-year-old Eritrean Ghirmay Ghebreslassie won the men's marathon in 2 hours 12 minutes 27 seconds, stretching away from Ethiopia's Yemane Tsegay in the final mile with Uganda's Solomon Mutai taking bronze.

Defending champion Stephen Kiprotich came in sixth, while world record holder Dennis Kimetto and double London Marathon winner Wilson Kipsang both dropped out at 30km.

Britain's Laura Weightman and Laura Muir both qualified comfortably from the heats of the 1500m, although Weightman suffered a nasty fall having crossed the line.

Nick Miller's first round throw of 77.42m, less than a metre down on his own British record, saw him qualify for the hammer final, but Michael Rimmer and his young compatriot Kyle Langford went out in the first round of the 800m.