Meysam Dalkhani and Ali Akbar Yousefi claimed two gold medals at the 63kg and 130kg respectively.
Facing 2013 Cadet World bronze medalist Levani Kavjaradze from Georgia, Dalkhani fell to a 6-2 deficit in the second period, but with less than 30 seconds left, the Iranian put the Georgian to his back with a hip toss for four points and a 6-6 lead on criteria.
Kavjaradze’s corner challenged the call, but it failed, resulting in a point for Dalkhani and securing a 7-6 win.
At 130 kg, 2019 Junior World champion Yousefi picked up his second World gold medal of the year, winning by injury default over five-time World champion Zviadi Pataridze from Georgia.
The final day of the U-23 World Championships begins Sunday.