An upbeat Sally Pearson, in London for the Diamond League Anniversary Games, believes she can retain her 100m hurdles world championship.
Australian hurdler Sally Pearson returns to London's Olympic stadium where she won gold a year ago hoping "happy memories" will spark a return to form ahead of next month's IAAF world championships.
The reigning 100m hurdles world champion says despite getting "slower and slower" in recent meets she's increasingly confident of defending her title in Moscow.
"I'm a lot more positive coming into this competition than I was in all the other competitions and I'm actually feeling excited about Moscow now," Pearson said ahead of competing in the Diamond League Anniversary Games on Saturday.
"I now am believing that three weeks is a great amount of time to finish off my preparations for the world champs.
"I do believe that I can win the world championships."
Pearson said her training indicated she could run fast times, she just needs to put a whole race together when it counts.
"Some races my starts have been really good, and the first half has been good, but the end hasn't been so good," the 26-year-old told reporters in London.
"Sometimes it can be the other way around."
After overcoming a frustrating series of hamstring injuries, Pearson in late June won her first race back after claiming gold at the 2012 London Games.
But she's struggled since.
The Queenslander on Thursday said the only "fantastic" time posted this year was Brianna Rollins' 12.26 seconds at the United States trials.
Pearson said the American's time was "way out there" and Rollins would want to repeat that at the worlds to take gold.
"I think it probably will take that (to win in Moscow)," Pearson said.
"My body remembers how to do it - it's just getting it done."
The Australian's PB is 12.28 when winning the 2011 world championships in Daegu.
The Olympic champion said returning to the east London stadium would be "bizarre" because "it's almost going to feel like the Olympic final again with the same girls".
"Walking through the tunnel out into the stadium will bring back some very happy memories and I hope they can spark some good energy through me so I can run a fast race."
Asked again about the positive drug tests for sprinters Asafa Powell and Tyson Gay, Pearson reiterated her view that the news was sad "but at the same time good because people aren't getting away with it no matter who they are".
She also felt athletes needed more education about what they were allowed to take: "Maybe these two were a victim of that - I'm not sure."