Father Ross Watson said his son's success in Hong Kong lifted him four places up in the International Judo Federation (IJF) world rankings to 14th for his age grade.
"Macau should see him back up to No7 or No8 on the world ranking list in the Junior Men's, which will be important for competition seedings next year."
Watson is flying back to Whanganui on Tuesday and will have a quick turnaround to compete at the Auckland Open International this weekend, where he will compete in the in the Cadets, Junior Men's and Senior Men's divisions.
After that he will be flying back to the Netherlands for training and conditioning work under mentor Grim Vuijsters, the fourth dan black belt.
Ross Watson said with a busy calender for the remainder of the year, such as Sydney, the New Zealand nationals and possibly Perth, the European training should have his son peaking at the right time.