The Aces set up a rematch of last year's Regional Bash semi-final by topping the Thunder Conference's southern pool in a rain-affected gala last weekend, a fortnight after the Wranglers edged through the northern group without a loss.

Tim Floros inspired the Aces' comfortable victory over the Wranglers in last summer's semi-final at the Sydney Cricket Ground, before the ACT outfit was beaten by the Coffs Coast Chargers in the decider.

Coached by CYMS premiership-winner Mick Delaney, the Aces cemented their spot atop of the pool with a seven-run win over fellow contenders the Border Bullets - both sides won their round one games a week earlier - on Sunday morning.

They earned direct qualification to Australia Day's finals series at the Sydney Cricket Ground courtesy of Mother Nature, with both of the final-round games abandoned after that afternoon's downpour.

"It's really exciting to go back to the SCG, probably right a few wrongs and make up for where we fell short last year," ACT skipper Rhys Healy said.

"Hopefully we're stronger, if we play the way we should then we can go one better. We've got the quality of players, so if we execute our plan and the way we want to play then it doesn't matter too much about the opposition.

"We've just got to back ourselves and if we prepare as well as we should then it'll be enough to get over."

Matt Condon played a crucial role in setting up the Aces' win over the Bullets, bludgeoning 56 as his side ground out a competitive, albeit somewhat meagre, 135.

"[Condon's innings] was crucial. He was key in the way he was able to dictate the game, put the pressure on the Bullets and set us up," Healy said.

"We probably left a few out there in the last overs to only get 135, we were probably looking to 140-plus. But the way the wicket was playing, especially early with the ball, we took three wickets and always felt we were ahead of the game and were able to control it."

Tyler Van Luin claimed 3-20 across his four overs and combined early with Ollie Anable (2-19) to leave the Bullets reeling at 3-14. They recovered on the back of Nathan Brown's composed 58, but he became Van Luin's final victim as the Bullets fell eight runs short of victory.

"Ollie and Tyler started off well for us with the new ball," Healy said.

"Tyler barely missed a yorker so made it really hard for them to score and took a couple of extra wickets. He definitely was the pick of our bowlers."

The Wranglers and Aces face off at the SCG on Australia Day, while the Chargers take on first-time semi-finalists Lake Mac Attack in the Sixers Conference semi-final.