Heavyweight Joseph Parker carries a permanent and visible reminder of his failure to stick to a game plan. As he prepares to fight on the undercard of Alex Leapai's world title challenge against Vladimir Klitschko in Germany on April 27, he is determined to put his lesson to good use.
Boxing: Parker vows to keep head against Ukrainian

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Joseph Parker. File photo / APN
"I'm happy I learned the lesson because if I did that in an important fight, a title fight, it wouldn't be so good."
Trainer Barry said yesterday he felt the potential Rudenko fight had come too early in Parker's short, albeit undefeated, professional career, a sentiment he shared before his charge fought 44-year-old Frans Botha, the most high-profile of his seven victories.
Barry also expressed concern about Parker's loss of self control against Tatupu, saying there is no guarantee it won't happen again.
"Who's to say we don't go over there against Rudenko, if the fight gets made, and Rudenko gets under his skin? Or someone says 'hey you can't stand there and trade [punches] with this guy' and he goes 'really, watch me'.
"We have to be better than that. We can't afford any more mistakes."
Parker leaves Auckland with Barry for a training camp in Las Vegas on Saturday.
Leapai, the 36-year-old Samoan who spent nine years in Auckland before moving to Australia, earned his shot at Klitschko after beating the previously undefeated Russian Denis Boytsov.