Bolt begins with a bang
Attention turned to the men's 100 metres for the right reasons on Saturday night as Usain Bolt got his quest for World Championship glory under way.
The build-up to athletics' premier event has been blighted by controversy, with a drug scandal casting a cloud over the competition.
Tyson Gay, the fastest man of 2013, is not competing in Moscow after failing a drugs test, while former world record-holder Asafa Powell misses out for the same reason.
As increasing scrutiny falls upon the discipline and on sport as a whole, Bolt's return to action will have helped raise spirits.
Having seen the Cayman Islands' Kemar Hyman disqualified for a false start, the Jamaican, who suffered the same fate in the Daegu final two years ago, eased through the final heat of the day in 10.07 seconds.
"I feel good," Bolt said. "I am just happy to go again.
"I am excited and couldn't wait for the start to come so I am just happy to go again, execute and get it done.
"This is a quarter-final so I wasn't really worried. I was just listening for the gun so that was good."
American Mike Rodgers was the fastest qualifier in 9.98 secs, with countryman Justin Gatlin just a hundredth of a second slower.
Peimeng Zhang's 10.04s run in heat four was a Chinese record, while Kemar Bailey-Cole, Nesta Carter and Jimmy Vicaut also won their heats.
There was good news from a British perspective, with all three sprinters making it through to Sunday's semi-finals.
Veteran Dwain Chambers automatically progressed by finishing third in his heat with a time of 10.14s.
Britain's Harry Aikines-Aryeetey finished fourth and outside the automatic qualifiers, but his 10.16s time saw him through as one of the fastest losers.
It was the same for James Dasaolu, but progression was far less impressive.
Less than a month after becoming the second-fastest Briton of all-time, he finished 24th out of 24 qualifiers.
Dasaolu has been plagued by a hip problem in recent weeks and it showed as he finished fourth in 10.20s.
"I haven't had the best of preparations since my 9.91," he said. "I had a hip problem when I had to pull out of the Anniversary Games.
"It's been my first time out of blocks for two weeks, and I didn't know where I was coming from as I haven't been able to train as much.
"I just hope I correct a few things and do myself justice at these champs.
"I thought I had third in the bag and I eased up to save energy like you do through the rounds - I'm glad it hasn't cost me a spot in the semi-finals.
"It felt all right, I had no pain and no problems, it took a bit of time to get it to where it needed to be but now I'm pain free.
"I'd like to believe I can race better. My body will adjust overnight and I'll step my game up - it was just rustiness."