Porter on a misson in Moscow
Tiffany Porter is on a redemption mission at the World Championships in Moscow.
The 25-year-old 100 metres hurdler has endured a tough couple of years, seeing her hopes of what looked a certain medal at the last edition in Daegu two years ago ended by a stumble at the penultimate barrier and her London 2012 ambitions blown apart by a terribly-timed back injury.
And throughout it all the United States-born sprinter has had her Great Britain credentials questioned, critics of her recruitment from overseas labelling her a 'Plastic Brit'.
"I'd be lying if I said I wasn't frustrated and disappointed with how last year went, but I use it as motivation for this year and it's really helped to spur me on," Porter, who failed to reach the Olympic final, told Press Association Sport.
"I'm looking forward to running and hopefully redeeming myself.
"You can't let those get you down, you can't really focus on negative things like that. I just turn everything into a positive.
"I'm really fit and really confident, it's just a matter of me putting my race together, executing a good race and if I do that it'll be really special."
Porter hails from Ypsilanti, Michigan, but has held dual American and British nationality since birth as her mother is British.
She is ranked 10th in the world, with eight of the top nine made up by Americans, but with only four on the US team her chances are higher than that suggests.
Australia's world and Olympic champion Sally Pearson has not been as dominant this year either because of injury, although she did beat Porter into second at the London Anniversary Games.
Porter, who also lost her British record to Jessica Ennis-Hill at the Olympics, added: "The thing with the hurdles is it's always really competitive, we all have 10 barriers ahead of us so anything can happen on a given day.
"I go into it with the same mentality no matter what the meet is, if it's the Olympic final or if it's a small club meet, and that's just to focus on my lane and do my best. I think it's going to be a good run."
Porter was in tears as she spoke to the press in Daegu two years ago, the best form of her life having gone unrewarded due to one lapse of concentration, and again as she hobbled of the track at Crystal Palace three weeks before the Olympics in clear distress.
This time she is hoping for some better luck.
"I sure hope so, that would be nice," she said. "I am healthy so that's half the battle right there."