Super Rugby Pacific: Brilliant Beauden Barrett believes he can still get better as Blues march on

Two tries, one assist and a Blues playoff win would have most resting on their laurels - but most aren't as talented as Beauden Barrett.

The first-five was at his brilliant best in his side's 35-6 victory over the Highlanders in their Super Rugby Pacific quarter-final.

The table-topping Blues made light work of the travelling southerners and have set up a semi-final clash with the Brumbies on Saturday.

Barrett was entrusted with the captaincy for the fixture after regular skipper Dalton Papalii was a late withdrawal after undergoing an appendix surgery and looked unphased by the extra responsibility.

He scored the Blues' second and third tries, before a thumping kick downfield allowed replacement winger, AJ Lam to dot down.

With All Blacks selection just right around the corner, it remains to be seen who will be trusted in the No.10 jersey against Ireland but Barrett isn't willing to let up just yet.

"The challenge is to not drift in and limit those options. It's ongoing work on and being the link between the forwards and the backs gives the whole team opportunities to keep teams honest in defence," he said.

"That's where tonight I didn't get it right all the time, so I need to be hard on myself and stay active. Generally [I'm] feeling pretty good but I'll be hard on myself when I look at the tape.

"When I found out about poor Dalts [Papalii], it was an initial shock but we rallied together well and just got on with it, so it's an exciting challenge for me personally.

"I'm well supported, got plenty of great leaders in the team and got great coaches as well. We're just stoked to win this first finals game and give us another opportunity next week."

You'd be hard-pressed to find a Blues player who didn't play well against the Highlanders but Roger Tuivasa-Sheck may have had his best outing of the season.

Barrett and Blues coach Leon MacDonald heaped praise on the rugby league convert after he scored his first try for the team since making the code switch.

"What I'm getting is a lot more solutions and feedback on that, rather than it being only one-way when it is a two-way thing," Barret said.

"It just shows how well he's understanding the game now. I think Rieko [Ioane] has been a great help with him too, just offering him his advice and I'm just happy to see Rog develop the way he has."

"He's just starting to play with a lot of freedom now. He's not thinking about where he should not be standing and what a spiral pass feels like," MacDonald added.

"He gets excited when the ball is around him and he wants to play. It gives guys like Beauden the confidence to let it go and now he's becoming demanding of people around him.

"We need him to be that player, we need him to really stand up and his leadership skills that he's shown with the Warriors, he's able to start bringing that confidently to the Blues now."