In-form Bourke was fresh from a narrow 21-18 defeat in the Summerset National Open Singles in Christchurch last week by international Black Jack Jo Edwards.
In the every next round Edwards then beat Patterson 21-9 to make the final of that tournament only to be defeated herself by another Kiwi international in Katelyn Inch from the Broadbeach club in Queensland.
In the men's section Wanganui father and son pair Ray and Clint Park went through both days unbeaten for a chance to add to their already impressive tally of centre titles together.
Winterburn and Broderson, however, had to pick themselves up after being dealt to by the composite pair of Mike O'Leary from Wanganui and Laird Park's Danny Wildermoth during qualifying on Saturday.
The Durie Hill pair responded to the challenge winning all their following games to make the final against the Park pair in March.
Both sets of finals are scheduled to be played at the St Johns Club greens on March 14-15.