Australian young gun Isaac Beacroft has doubled down on his Commonwealth Games gold medal with a record-setting victory at the world under-20 championships — just hours after it emerged his Glasgow rival had received a doping ban. The 19-year-old Aussie won the 10,000m race walk last week after a gripping battle with Kenya’s Stephen Kihu, breaking his chirpy rival with a pair of strong moves on the final lap. WATCH THE VIDEO ABOVE: Aussie Isaac Beacroft wins world under-20 gold medalKnow the news with the 7NEWS app: Download today ArrowBeacroft later revealed Kihu had been “taunting me the entire race”, urging him to speed up and take the lead. The news spread just before Beacroft claimed another gold medal at the world under-20 championships in Eugene, Oregon. Isaac Beacroft celebrates gold and his world record.