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Kat on medal mission

- ALAN SMITH

KATARINA Johnson-Thompson begins her fourth Olympic campaign this morning braced for another ride on the heptathlon roller coaster.

And the reigning world champion is hopeful that this time she can claim the one major medal to have eluded her.

As a teenager in London, KJT placed 14th while Jessica Ennis-Hill stormed to glory.

At Rio, four years later, poor showings in the javelin and shot put meant she finished a disappointing sixth.

And in Tokyo she was carted off with a torn calf, having faced a race to compete because of a ruptured Achilles.