Meanwhile, Watson's younger brother Callaghan has had success back home in New Zealand, winning gold in the intermediate school boys open held in Tauranga earlier this month where he also won silver in the intermediate over 66kg division.
The brothers are now preparing to compete in the Auckland International Judo Open which takes place in the last weekend of July.
The pair will compete in the senior boys plus 66kg shortly after Keightley Watson arrives back in New Zealand from China.
Having spend several weeks earlier this year recovering from a fractured fibula which he got after taking a knock in the Bremen Master Open in Germany, Keightley Watson was forced to miss the Oceania Championships in New Caledonia.
The rising star has a busy second half of the year planned, though, with several weeks of training and conditioning booked in the Netherlands with his mentor Grim Vuijsters.