Nikitaras was born in Port Kembla, a suburb of Wollongong, New South Wales, to Greek emigrant parents. He did not take up playing cricket until he was 19.[1] Batting right-handed and bowling left-arm fast-medium, Nikitaras was shortly afterwards selected for a Wollongong representative team, and within a year had progressed to the Sydney grade cricket competition. From the 1993–94 season onwards, he began to be regularly selected for New South Wales second XI matches.[2] Nikitaras made his debut for the senior team in a Mercantile Mutual Cup match against Western Australia during the 1996–97 season.[3] In the match, played in October 1996 at North Sydney Oval, he failed to take a wicket,[4] but was selected in another one-day match five days later, against Queensland, and again went wicketless.[5] Nikitaras' inaugural Sheffield Shield match came against Queensland the following month.[6] In the match, played at Bankstown Oval, Sydney, he took 3/76 in Queensland's first innings opening the bowling alongside Phil Alley.[7]
Although he appeared in several more matches during the 1996–97 season, including against a touring England "A" team,[3] Nikitaras did not play at all at state level during the 1997–98 season, and transferred to Western Australia the following season.[1] Playing for Perth in the local grade cricket competition, he made his debut for Western Australia towards the end of the 1998–99 season, in a Sheffield Shield match against Queensland at the WACA Ground.[6] Bowling first change behind Jo Angel and Matthew Nicholson, he did not take a wicket, and failed to play another match at state level during the season.[8] However, the following season was Nikitaras' most successful at state level. He gained regular selection in Mercantile Mutual Cup matches, playing seven out of eight matches in the tournament,[9] and taking seven wickets, third in Western Australia's bowling aggregates behind Angel and Darren Wates.[10] Nikitaras was particularly valued for his low economy rate, conceding just 4.00 runs per over to finish with Western Australia's best rate and the equal-fifth-best rate in the competition (for bowlers with over five wickets).[11] His best bowling figures, 3/30 from ten overs, came against the Canberra Comets in early January 2000.[12]