Asafa Powell equalled the 100m world record he shares with American Justin Gatlin at the Norwich Union British Grand Prix in Gateshead on Sunday.
Powell believes he can take the record as low as 9.60
With the benefit of a slight tail wind, the Jamaican clocked 9.77 seconds - the same time he set in Athens last year.
Briton Dwain Chambers proved he was back to form after a two-year drugs ban to take third in an impressive time of 10.07, behind Jamaican Michael Frater.
Powell and Gatlin are due to meet at the London Grand Prix on 28 July.
The duo were both contracted to race in Gateshead but Gatlin pulled out, with his agent, Renaldo Nehemiah, claiming a race against Powell was not part of the agreement.
The past has gone now and I can look forward to the future
Powell had some words for rival Gatlin after the race, declaring: "That's how you run a world record.
"I told everyone I can run as fast as I want to when I want to. I said I would do my best here and I didn't let them down.
"I ran 9.77 last year and I have proved I can do it again. It shows I am back to where I started last year and I am going to finish the season at the top.
"But my coach won't be all that happy because at the end I didn't do what he told me to."
Powell's performance swept aside Gatlin's record of 9.89secs for the fastest 100m on British soil, which he set at Crystal Palace last year.
The Jamaican 23-year-old spectacularly smashed Chambers' old stadium record of 10.06secs at a Gateshead track not known for its speed.
Chambers will hardly be concerned about his old mark after he jumped to the top of the British and European rankings.
The 28-year-old is the reigning European champion and is likely to seek selection to defend his title in Gothenburg in August.
Chambers recovered from a false start to take an impressive third
UK Athletics performance director Dave Collins has indicated Chambers will not be treated any differently to the rest of Britain's sprinters when he comes to choosing his squad.
Chambers was only cleared to race on Saturday after agreeing the terms of his repayments to both the IAAF, athletics governing body, and UK Athletics for the prize money he accrued whilst taking steroids.
The Londoner has been training in Jamaica under new coach Glen Mills but had not raced since September 2003 and was surprised with his performance.
"I didn't expect that at all - not at all," said Chambers. "Despite all the ups and downs, I showed I can still compete.
"I was pleased with the reception I got from the crowd. The past has gone now and I can look forward to the future."
Marlon Devonish led home the rest of the British sprinters, who all clocked season's bests.
Devonish finished fourth in 10.16, ahead of Mark Lewis-Francis (10.20) and 17-year-old Harry Aikines Ayreetey (10.38).
American Torri Edwards claimed the women's 100m title on her return to action following a 15-month drugs ban.
The former world champion streaked away from the field for a clear victory in 11.06 seconds ahead of Ukraine's Zhanna Block and Jamaican Commonwealth champion Sherri Ann Brooks.
Abi Oyepitan, returning after a shin injury wiped out her 2005 season, was the best of the domestic runners in sixth.