Christine Ohuruogu will go into this weekend's Olympic trials confident she is capable of running better in London this summer than she did to win gold in the 400 metres final in Beijing four years ago.
The 28-year-old enjoyed the greatest moment of her career so far by becoming the Olympic champion in the Chinese capital.
She ran 49.62 seconds to take victory, a time she has not come within half a second of since as injuries have hampered her progress.
The Londoner is known for saving her best for the big occasion, though, having set her personal best of 49.61secs in winning the world title in 2007, and her 50.69s clocking in New York earlier this month, her quickest run since 2009, suggests she is getting back to her best in time for the London Games.
She will look to seal her spot in London with a top-two finish at the trials in Birmingham on Saturday and thinks she can finally surpass her five-year-old personal best at the Olympic Stadium.
"I think that's what it's going to have to be, should I make the final," she said.
"The personal best I have is from '07, and I ran close to that in '08. I ran .61 in '07 and then .62 in '08. It would be nice to know that I can go faster. I think I know that I can run a better race than I did in '08 and that's what keeps me going, knowing that '08 wasn't my best race.
"But at the end of the day, whatever it takes is whatever it takes. The Olympic final might be won in 50.02."