Maurice Greene is past it according to Michael Johnson

Greene is still the Olympic and World Champion over 100m - but he has lost his world record to fellow American Tim Montgomery.

However, the 28-year-old nicknamed the 'Kansas Cannonball' has predicted that he will better Montgomery's 9.78secs mark this season.

Michael Johnson disagrees: "You have to look at it realistically, Greene's career has been unbelievable, no guy stays on top that long in the 100m but it's over."

He's not going to dominate anymore - guys now realise he can be beat Michael Johnson

World 200m and 400m record holder Johnson continued: "Not that he still won't have some good races but it's over him dominating. I can't see it happening.

"He's going to have some fast races but he's not going to dominate anymore - guys now realise he can be beat."

Greene finished third in his first race of the season in Oregon at the weekend in 10.33secs.

The sprinter was satisfied with his effort and predicted that he would win the 100m and 200m at the Paris World Championships.

The showdown between Greene and Montgomery is expected to provide the highlight in Paris.

But Johnson does not see the American pair having it all their own way in France.

"I think we'd all be setting ourselves up for some huge disappointment to start talking about a huge showdown between Montgomery and Greene," he said.

"Tim Montgomery and Maurice Greene could very well not even medal at the World Championships.

"Montgomery has a coaching crisis trying to find someone to coach him.

"And Greene still isn't back to the form he was and he may never get back there.

"I would actually bet against those two guys going gold and silver, I think there are other guys in there who can break it up.

"One of those guys might get a gold or a silver but they won't be one-two. And I don't see a world record this year.

"I think it's going to keep falling but probably next year, most of the guys who are running well right now have other issues going on."