Japanese No. 1 Moyuka Uchijima beat Romania's Anca Todoni to dash Romania’s hopes of reaching the finals after Ena Shibahara had got Japan off to a flying start in their Billie Jean King Cup Qualifiers Group A clash on Saturday.

Shibahara beat Miriam Bulgaru 7-5, 6-2 and Uchijima overcame Todoni 3-6, 7-6 (3), 6-2 in 2½ hours in Tokyo to set up a winner-takes-all showdown with Canada on Sunday.

Todoni earned the first break to move ahead 4-2 in the opening set and maintained her advantage to close it out 6-3.

The Romanian also led for much of the second set before Uchijima saved two match points and broke back to force a tiebreak.

Uchijima dominated that and broke Todoni twice in the third set to seal victory.

"I don’t know how I won the match. I am just happy that I was able to pull it off. Of course, the fans helped me a lot," Uchijima said.

Shibahara had put Japan ahead to the delight of a vocal home crowd, pouncing at 6-5 to claim the first set and breaking Bulgaru twice in the second.

"I was nervous in the beginning. I think overall I played well," Shibahara said. "It (the crowd) helps me so much, I love it when they’re loud. I really kept pressing and being aggressive."

Australia completed a 3-0 sweep of Colombia in Brisbane, but it was not enough to reach the Finals in Shenzhen as Kazakhstan had already secured top spot in Group D.