The Polish-Indonesian duo defeated Alexandra Eala of the Philippines and Nadiia Kichenok of Ukraine 6-7, 6-3, 10-5 in the semifinals on Saturday.
Piter and Tjen will face Eudice Chong of Hong Kong and En Shuo Liang of Taiwan in the championship match on Sunday.
In March, Piter won the Mérida Open in Mexico with Egyptian Mayar Sherif, claiming her fourth career doubles title.
(gs)
Source: IAR, PAP