British heavyweight Audley Harrison has insisted that he is 'feeling sharp' ahead of his showdown with unbeaten American Deontay Wilder in Sheffield on Saturday night.

Harrison has indicated that he will retire should he fail to defeat Wilder, but the 41-year-old believes that he can become the first boxer to stop the up-and-coming 27-year-old.

The former Olympic champion told the Daily Star: "I am razor sharp. I am now the complete fighter, and I know that I can become the first person to stop Deontay as I continue on my journey."

The southpaw fighter has won 31 of his 37 professional bouts.