WORLD UNDER 21 CHAMPIONSHIP: Semi-final finish for Jack
The Australian ace collected a total of 11 points in testing conditions at a rain-lashed Poznan track in Poland.
And Holder could count himself hugely fortunate to avoid serious injury after being hit by rival Anders Lyager in the opening bend of that semi.
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Hide AdThe Danish rider suffered a broken collarbone when slamming into the track while Holder went on bring up the rear in a re-run won by overall victor Maksym Drabik.
The Polish ace reeled off a seven-ride, 21-point maximum to take command in the overall standings. He leads by six points from runner-up and fellow Pole, Bartosz Smektala.
The remaining two rounds are both in September at Gustrow in Germany and Pardubice, in the Czech Republic.