Britain's Katarina Johnson-Thompson achieved the Olympic 'B' standard in the heptathlon and broke the national junior record set by Jessica Ennis.
The 19-year-old managed 6,007 points despite heavy rain in Italy, surpassing the 'B' standard of 5,950 and Ennis's junior record of 5,910.
Her total smashed her personal best by more than 200 points.
But Johnson-Thompson tweeted:
"I've let myself down. I will be attempting to get Olympic 'A' standard soon."
A level result
The Olympic 'A' standard is 6,150 points, which Katarina Johnson-Thompson missed by 143.
Former world youth champion Johnson-Thompson led after the opening day in Desenzano after recording three new personal bests in the 100 metre hurdles, shot and 200m.
In poor weather on the second day, she managed 6.14m in the long jump, 37.17m in the javelin and two minutes 18.89 seconds in the 800m.
Johnson-Thompson finished third overall behind Sofia Ifadidou of Greece and France's Blandine Maisonnier, with fellow Britons Louise Wood, Phyllis Agbo and Katy Marchant 11th, 13th and 18th respectively.
Former Olympic bronze medallist Kelly Sotherton pulled up injured in the 200m, the final event of day one on Saturday.
There was no immediate word as to the severity or nature of the injury.