Batsman pick Bumrah late because of his unconventional action: Bharat Arun

India bowling coach Bharat Arun has been working on Jasprit Bumrah since his U-19 days.

India's bowling coach Bharat Arun Saturday said that Jasprit Bumrah's unconventional bowling action has made him one of the most lethal pacers in world cricket as his deliveries are difficult to be picked by opposition batsmen.

Bumrah, who has so far taken eight wickets in the third Test against Australia here, has 47 Test wickets to his kitty after making his debut in January.

"What makes him (Bumrah) so special is because he is so unique (in his bowling action). Maybe the batsmen pick up his balls a little later than which they normally do from a clean action and that makes him so much more potent. Of course, for any fast bowler to be bowling 145 clicks and above consistently over a period of time, you need to generate a lot of speed from your arms," Arun said.

"We were extremely confident of Bumrah doing well even before he started playing Tests because he was unique and most batsmen who played against him said it was difficult to pick him," he said at the post-match conference after the fourth day's play.

Australia were left struggling at 258 for 8 in their second innings as the Indian pacers shared five wickets on the fourth day Saturday. India need two wickets on Sunday to take an unassailable 2-1 lead in the four-match Test series.

Arun said that the coaching staff needed to work on the 25-year-old Bumrah to keep him strong as his bowling action puts a lot of strain on his body.

"I had the opportunity to work with Bumrah when he was at U-19 level and when I was with NCA. I felt Bumrah was able to generate a lot of pace with his action, but puts a lot of strain on his body. It was a challenge and we had discussions with the physios and trainers. We came to the conclusion that we need to work on him to become extremely strong to be able to sustain his bowling.

"He was someone who did exceptionally well in the domestic championships as well. So, we thought we would give him a go," the bowling coach added.

Arun termed 2018 as the breakthrough year for the Indian pacers as they have succeeded on three successive overseas tours in South Africa, England and Australia.

"Definitely yes (this is the year). Right from the period, we started the tour of South Africa, England and right now, they (pacers) have done exceptionally well. Recently I was told that they have broken the record of West Indian trio and that speaks volumes about these fast bowlers," he said.