Jamaican sprinter Yohan Blake said he could beat his personal best of 9.69 seconds in the men's 100m sprint in Zurich.
Blake said: "Well, I'm a man of surprises, I always tell you guys, I like to surprise people and you never know what can happen on the day - that's the kind of guy, I am."
His comments come ahead of his race at the Diamond League meeting in Zurich.
Last Thursday, Blake beat his previous best by 0.06 seconds as he destroyed a world-class field in the 100 in Lausanne, leaving Tyson Gay and Nesta Carter trailing in his wake.
Asked about whether he would challenge his training partner Usain Bolt's current world record of 9.58 seconds in 100 metres, Blake said:
"Well, I go there, I don't think about the world record, I just think about what my coach told me, you know to execute a good race and from executing a good race, the time will come.
"I'm a beast, I don't really care about weather or whether it's cold, hot or anything, you know, I just go there and run."