Multiple sprint champion Usain Bolt was delighted with his fastest time of 2013 before a large crowd at the Anniversary Games in London's Olympic Stadium.
Bolt, who competes in Saturday's 4x100m relay, started slowly in the 100m but surged through to win in 9.85 seconds.
"I knew it was going to be a big crowd, but when I got out there it was ram-packed and the energy was still like the Olympics," the 26-year-old said.
"I was slightly nervous, but I loved the energy of the crowd."
Describing his return to the London stadium where he set an Olympic record of 9.63 seconds last year, Bolt, who was paraded before the crowd on an adapted imitation rocket, said: "It was beautiful and I love competing here."
The Jamaican, who has six Olympic gold medals and five in the World Championships, called his start in Friday's race "horrifying" but is in confident mood ahead of the World Championships in Moscow from 10-18 August, as he attempts to regain the title he lost in 2011 after being disqualified for a false start.
"I think it is just race rust and I just need to get a few races in," he said.
"The rounds in the World Championships will help that and get my legs freer and a bit lighter."