Jamaica’s defending champion Usain Bolt made it through the 100m heats without alarm to reach the Olympic semi-finals.
Bolt cruised through in Rio in 10.07 seconds, as American rival Justin Gatlin qualified fastest in 10.01.
Britain’s CJ Ujah (10.13) and James Dasaolu (10.18) went through as the eighth and 19th fastest qualifiers, but James Ellington (10.29) is out.
The semi-finals take place on Monday from 01:00 BST, with the final scheduled for 02:25 BST.
“I’m happy to get the first one out, it felt OK,” said Bolt. “It wasn’t the best start. Hopefully tomorrow I can go much smoother, I’m feeling good, I’m happy.
“Now it’s all about execution and getting it right when it comes to the final.”