Andy Murray believes a change of approach helped him come from a set down to beat Tomas Berdych in the Australian Open semi-finals on Thursday.

The British sixth seed reached his fourth final at Melbourne Park with a 6-7 (6-8) 6-0 6-3 7-5 victory over Berdych on Rod Laver Arena.

Berdych had looked to be overpowering Murray during the first set, but the Scot was in control after that.

Murray felt he made the right adjustments during the contest " although Berdych had said after the match he saw no change of tactics.

"Well, I thought the beginning of the match he started out well. I was a little bit tentative at the beginning and getting used to his ball," Murray said.

"He hits the ball extremely hard and flat. At the start I felt like I was on the back foot a little bit.

"Towards the end of the first set I started to come into it more, be more aggressive.

"Then [in the] second set I just picked up from how I was playing at the end of the first. I felt like I could have won the first set. Obviously had some chances there.

"I was extremely aggressive in the second set. Managed to run away with it."

While Berdych denied there was extra tension between the pair, Murray said it was there at the beginning.

Much of the focus in the lead-up was on Murray's former coach and friend Dani Vallverdu, now Berdych's mentor.

Murray blamed the media for creating the extra tension between the players and their respective camps.

His fianc Kim Sears contributed with a foul-mouthed rant during the first set.

"It was only in the first set was there tension, like right at the beginning of the match," Murray said.

"Then obviously like even at the end of that, like during the tie-break, there was nothing.

"It wasn't like there was loads going on there. Obviously at the end of the set, yeah, when he said something, that was really the last thing in the entire match where there was any tension.

"It was fine after that."