Kammala jumla mai zuwa: Petersen ya kafa tarihinsa na iyo a 1999 Pan Pacific Swimming Championships a Sydney, inda ya zama na huɗu a cikin mita 100 na nono, kawai karamin sashi a waje da podium. A waccan shekarar, Petersen ya ba da lambar zinare ga Afirka ta Kudu a tseren mita 100 (1:02.63) a gasar Olympics ta Duniya.
Wasannin Afirka a Johannesburg.