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Should Llanelli-born Greene take gold, he will join an elite group of Welshmen (, Colin Jackson and Iwan Thomas) who have won the European and Commonwealth titles in the same season. For a man voted Welsh athlete of the year a few weeks ago, and who missed out on the chance of competing in his country's vest four years ago, it's a big deal.

"Those three are great names with great careers. Last time I didn't get the opportunity to run for Wales, and the chance only comes round once every four years - there was no way I was going to pass up the opportunity this time. To pick up a Commonwealth medal now would make it a dream season for me."

Greene is perhaps the highest-profile of the home nation athletes in India. He has enjoyed a fabulous season - taking a first major title, proving his global class on the Diamond League circuit and going second on the all-time British lists ahead of luminaries like - but it has been at a price.

"It's been difficult mentally to keep myself going," he admits, when we meet at the athletes' village two days before his heats. "In my event you have to push yourself to the limit on a regular basis, and if you're not there mentally it's very hard to do that on a regular basis.

"Before Delhi, we were at a holding camp out in Doha. It was 40-something degrees every day - perfect weather to prepare us for India - but things didn't go entirely to plan; I got a tummy bug which set me back a few days.

"But the staff around me were great. They attended to every need I had, and I'm definitely over it now. I've got a great coach in Malcolm Arnold, who knows exactly what he needs to do with me, and I've had some great sessions since I came to India. I'm looking forward to kicking it all off on Saturday."

Greene, like many athletes at these Commonwealths, has had to structure his training carefully to ensure he can peak at a time in the year when he would normally be returning from holiday and starting his 2011 base-work.

The added complication in his case was his form at the end of the summer season. With the exception of a below-par performance at Crystal Palace ("if the meet hadn't been in London, I probably wouldn't have done it, but I wanted to turn up for the fans and try to put on a good show") he was getting faster with every outing.

"After Barcelona [the Europeans] I didn't think I could get much faster. I thought I'd hit the ceiling there. But I seem to have got quicker and quicker with every race.

" I actually thought it was a shame there were no more races after Split, because I was desperate to race. I can't wait to get out on the track."

Alongside him in Delhi will be , European silver medallist, compatriot and training partner.

With so much superficially in common, you'd expect the two to be best friends. In fact, the enmity between them is what in part drives them on.

"It's no secret that we're not great friends or anything," says the 24-year-old, matter-of-factly. "We don't socialise together off the track, our coach doesn't like us racing against each other in training, and we have completely different training programmes.

"Some people say it's a bit dysfunctional, but at the same time we brought back the gold and silver from Barcelona with personal bests, so something clearly works there. Maybe other people should hook up with their rivals a little bit more. It works for us, and there are plenty of other guys on the team for us to socialise with."

One of the most notable aspects of Greene's displays in Barcelona was his unshakeable confidence. When I spoke to him a fortnight before the heats, he was quite happy to state that he would and should win. There was nothing cocky about it, just a logical assessment of his own abilities and those of his rivals.

"I don't really feel the pressure," he says. "I was very proud to receive the Welsh athlete of the year award - it's a great honour - but the only pressure I feel is the pressure I put on myself to achieve.

"I've set myself the target of the gold medal in Delhi, but the way things have gone in the build-up I really shouldn't be aiming for anything else.

It would be settling for second best if I said I just wanted to get on the podium. That would be underselling myself."

In Delhi he expects his main challenge to come from South Africa's reigning Commonwealth champion LJ van Zyl ("he's in decent form this year, and he'll be a real danger) and compatriot Williams ("he did fantastically well in Barcelona - I do hope that he's up there on the podium").

Beyond that, could 18-year-old British record finally go? In Split last month, he was just six hundredths of a second away.

"Medals first, times second in my mind," Greene says firmly. "That's my priority - I do the sport to win medals.

"It would be fantastic if I were to dip under that standard but I just want that gold medal first. If it does come, it'll just make it that little bit sweeter."