How about two working together?

The West Indies can attest to that double trouble after the opening day of the Frank Worrell Trophy at Optus Stadium on Wednesday.

Because not for the first time, Steve Smith and Marnus Labuschagne have proven they are cricket's most dangerous pair of batting aficionados.

Labuschagne will enter day two on 154no, eyeing off the second double-century of his career when Australia resume on 2-293.

Smith is 59no, a chance of joining Labuschagne with two straight Test centuries after showcasing the benefits of his technical adjustments in recent months.

Batting more side on and with less movement at the crease, Smith drove through the covers and pulled in front of square like earlier in his career.

"We certainly spoke a lot about (Smith making the technical changes)," Labuschagne said.

"We talk a lot about batting and it's been well documented about his grip and how it feels and stuff like that.

"He's done this no-trigger for a while. He started in Sri Lanka in the one-dayers ... he wanted to get his momentum into the ball and not moving across the stumps as much."

Labuschagne is not convinced this is the best he has seen Smith bat, after the 2019 Ashes where the former captain hit 774 runs at 110.54.

"The conditions were tough, it was nipping around and he made batting ridiculously easy," Labuschagne said.

"From an onlooker, that's the best I've seen him bat. But in terms of feel, he would say that looked ugly.

"What's feeling comfortable for him now (is this). But I'm sure give it 12 months, there'll certainly be something different.

"Everyone's always changing, trying to get better and sometimes you just go down different loopholes and different feels.

"But this is what's feeling really good for him at this stage."

Smith is not alone in making changes.

Labuschagne has also addressed his own technique since last summer, when he was caught playing needlessly outside off stump too often.

"I certainly looked at a lot of that stuff," Labuschagne said.

"My stance is probably more closed off from what it was last summer. I am probably not as rigid as I was last summer.

"I feel like I'm a little bit more relaxed in my hands. That's helping me on that short ball and that back-foot punch.

"So I don't really get stuck and then start fending the ball away from my face."

Australian Associated Press