Question marks have been raised about their ability to trouble batsmen in overseas conditions but spin twins Ravindra Jadeja and Ravichandran Ashwin has proved their critics wrong\u009d with an impressive start to their World Cup campaign, feels teams premier batsman Virat Kohli. With convincing wins over Pakistan and South Africa in the first two games, no one can deny the role played by off-spinner Ashwin and left-arm spinner Jadeja. Between them, they have taken six wickets (4 for Ashwin and 2 for Jadeja), having collectively given away only 175 runs in 36.2 overs at an economy rate of less than five runs per over (4.83). "If you see, they were our two main bowlers in the Champions Trophy in England. Jadeja was adjudged 'Best Bowler'. No one then had expected that our spinners will become our main bowlers. They proved everyone wrong then and even if you see here in Australia, they are again doing well,\u009d Kohli gave his observation on the performance of the duo before the match against South Africa. As per vice-captain Kohli, the duo have proved how true the old adage \u00e2\u20ac\u0153offence is the best defence\u009d is. He doesnt believe that if one plays an attacking role, the other needs to don the defensive hat. I think, first and foremost, your mind-set should be to take wickets. Ashwin had that mind-set in the first game (vs Pakistan). Jadeja is always an attacking bowler and if gets a bit of assistance, he becomes even more dangerous. We saw that during Champions Trophy in England,\u009d Kohli said. The duo hasn't been taken apart by the two quality teams in the first two games and Kohli feels that on big Australian grounds, one can be rewarded if the homework is done properly. In Australia, you have long boundaries, square boundaries. If you bowl intelligently, you will be rewarded. They have been our main bowlers for some years now and they haven't done badly in Tests either. Kohli completely agrees that not only fast bowlers but spinners also hunt in pairs and it's upto the duo to devise a plan as to who would go for wickets and who would like to bowl wicket-to-wicket. I think their bowling partnership is very important for us. Between the two, they will have to realise, who is going to be aggressive and who is going to play the supporting role,\u009d he observed although his own take is to attack from both fronts.