O\'Brien smashed a 50-ball 100 on Wednesday, 16 balls fewer than Hayden\'s mark set in 2007.
Colombo: Retired Australian batsman Matthew Hayden reacted with disbelief at losing his record for the fastest World Cup century, but he's delighted for Ireland's Kevin O'Brien for achieving the feat against England.
O'Brien smashed a 50-ball 100 on Wednesday, 16 balls fewer than Hayden's mark set in 2007, as he propelled Ireland to a stunning upset win by three wickets in the Group B match.
"Well, honestly when he said that I couldn't believe it," Hayden said of his feelings soon after being informed of losing his record.
Hayden told the International Cricket Council in an e-mail, circulated before Australia's Group A game against Sri Lanka on Saturday, that "it didn't sink in" that O'Brien had not only broken the record but also beaten England — which had recently defeated the Aussies in the Ashes.
"I explained that I was delighted for Kevin and that I wish I could get a note out to him reflecting my thoughts to that effect and ... would do so at the first convenient opportunity," Hayden said. "This is just that opportunity."
Hayden played 161 one-day internationals for Australia, mainly as an opening batsman, scoring 6,133 runs at more than 43 runs per innings.