Diver Tom Daley, who's recovering from an injury, finished a disappointing ninth in the 3m springboard final at the Youth Olympics in Singapore.
A mistake in the third of his five dives cost the 10m world champ.
"These kind of competitions, when you don't do well, really make you determined to do well in the next one," Tom said afterwards.
The British star hurt his arm earlier this month and he only announced he'd compete at the Games on Friday.
Gymnast Sam Oldham won Team GB's third gold of the Games
He decided to stay out of the 10m platform, the event he holds the world title in.
But there was good news for gymnast Sam Oldham, who won the horizontal bar competition to give Team GB's third gold medal of the Games.