The results of the penultimate round of the Dick Hunt holiday cricket competition have left the points table perfectly poised for a thrilling sixth round next year.
Union found their form again with a win over Valley after a hammering from Albion in round four.
Skipper Thomas Shields said the victory kept his side's hopes alive and he was expecting a tough clash with Oamaru when the tournament resumed on January 19.
"It was a big win for us, it keeps us in the hunt in the Dick Hunt," he said.
"It'll be tough against Oamaru. They've got Stephan Grobler now so it'll be difficult, it's a must-win for us."
Oamaru were toppled by Albion at Excelsior.
The Choccos were all out for 200 and felt the batting wrath of Nigel Moriarty (63) and the in-form Peter Cartwright (28).
The win puts the Mungas in a commanding position at the table's summit ahead of their round six clash with Valley.
Steve Halliwell said he was happy with his team's impressive chase down in 46 overs but won't be taking Valley lightly in the final round.
The Dick Hunt competition will now be put on the back burner with the Tui Twenty/20 taking over on January 12.