Asafa Powell believes he can run even faster after setting a new 100m world record of 9.77 seconds.
After beating Tim Montgomery's mark of 9.78 at Athens' Olympic Stadium, the Jamaican told BBC Sport that his coach was "mad" about his performance.
"It wasn't perfect, my coach is mad at me," said Powell.
"In the last 30m, I was tightening up because I was trying to push it too hard when I should have been relaxing down. I can be faster."
Powell, who missed out on gold at the 2004 Games, is now keen to lower his record further and win world and Olympic gold.
But Montgomery, while praising his rival's achievement, vowed to try to regain his world record.
"What a shock - it is a real surprise for several reasons," said Montgomery, who is awaiting the result of a doping hearing.
"Firstly we are at the beginning of the season and normally these sort of times come at the end of the campaign.
"Then it appears that he ran alone, by which I mean he did not have athletes of a similar level to push him.
"I tell you that I am really going to work hard to regain my record," he said.
"As for Powell he must now manage his new responsibility. He is no longer a sprinter among other sprinters, he is the one who cannot afford to lose."