Together with several team-mates, O'Brien has dyed his hair in support of a campaign by the Irish Cancer Society.

Sportsmen are reluctant to change a winning formula and O'Brien, who in all made 113 off 63 balls, said: "My girlfriend doesn't really rate it, she is begging me to shave it off but I might just hold that for a couple more weeks."

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O'Brien, whose brother Niall is Ireland's wicketkeeper, had family support in the stands Wednesday.

Both his parents were at the ground to watch an innings that surpassed former Australia batsman Matthew Hayden's 66-ball knock against South Africa at St Kitts four years ago as the fastest World Cup ton.

"There's two proud people in the stands and probably four million proud people at home," he said.

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