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By Saj Chowdhury
BBC Sport in Doha
As she started a lead over defending champion Nafissatou Thiam on the very first day of the heptathlon at the World 28, katarina Johnson-Thompson made two personal bests.
The Briton has 4,138 points after four events with the Belgian second (4,042) along with Kendell Williams third party (3,855).
The 26-year-old won her 100m hurdles race at 13.09 seconds – taking 0.21secs off her previous best.
Her large leap was 1.95cm until 13.86m at the shot – a 71cm improvement.
Johnson-Thompson then ran 23.08 in her 200m heat to regain the lead heading into the last few areas on Thursday.
To end the day on top is actually important, Johnson-Thompson told BBC Sport. I have still got three events to negotiate but to end the day in addition to a not great 200m, Im happy to be at the top.
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The Liverpool athletes day-one advantage over Thiam is a slight improvement on last seasons European Championships, although Thiam went on to win the name by 57 points where the guide has been 87 points.
Adhering to the shot put, British Sydney 2000 champion Denise Lewis told BBC Sport:We have seen her face so glum for many years to conquer it here is just fantastic. Shes currently demonstrating that shes a rival. She is ready.
Dame Jessica Ennis-Hill, the former world and Olympic heptathlon champion of Britain, said she had been impressed by the beginning of Johnson-Thompson to the contest.
That is the way you wish to begin a heptathlon, said the 33-year-old. She got to her halfway and running down the track you saw her enter her rhythm.
I almost thought Thiam was going backwards, but Kat was pulling away from her
It was a disappointing mens hammer for Briton Nick Miller. He came to the event ranked fourth on the planet, however, the Carlisle-born 26-year-old only handled 75.31m as he finished 10th.
He later lodged an appeal against a foul given for his second throw of the day, which if successful would have propelled him.
However a jury panel upheld the decision to call a foul throw.
Elsewhere, Great Yarmouths Sophie McKinna celebrated hugely as she booked her place in Thursdays shot put closing with 18.61m – the sixth best attempt in qualifying and nearly 40cm better than her previous best.
Im never speechless but I am speechless today, said the 25-year-old, who celebrated by running across the trail.
Because of thrower, you usually know when you let go of this in case its a great throw. I didnt expect that.
For a final and perform to the best of my skill at a World Championships – it means the whole world.
Laura Muir eased into the 1500m semi-finals, although fellow Scot Eilish McColgan was another member of the Great Britain team to impress as shes qualified for Saturdays 5,000m final as fourth fastest with a time of 14 minutes 55.79 minutes – fewer than eight seconds shy of her own personal best.
Team-mate Laura Weightman, trained BBC commentator Steve Cram and by former world champion, made it through and was fifth , nevertheless Jessica Judd missed out.
Defending champion Hellen Obiri of Kenya has been the fastest qualifier.
In the mens 110m hurdles final, the defending winner of Jamaica Omar McLeod dropped because he looked to challenge pioneer Grant Holloway over the last set of barriers.
The 21-year-old American stayed on his feet to triumph in 13.10 minutes. Russian 2015 winner Sergey Shubenkov, competing within a Authorised Neutral Athlete, took French champion Pascal Martinot-Lagarde and silver won bronze.
British world indoor 60m hurdles champion Andrew Pozzi, that just recently returned to racing after 2 months out, had previously failed to qualify for the closing.
The boys have a stroll on the wild side
It throws to distance and cross country running or sprints and has among the broadest ranges of choice in game, from leaps.
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