"I am very impressed with Yadav. He is the first genuine fast bowler that India has got. I don't think before him India had a genuine fast bowler. Another boy (Mohammed) Shami is also good. But I want both of them to be a bit more aggressive. And when I mean aggressive, I don't mean one needs to swear," Roberts, one of the fearsome fast bowlers of all time, told PTI during an interaction.
"Let me just tell you that there is a lot of difference between a fast bowler and quick bowler. Kapil Dev was a swing bowler but he was not a quick bowler. India's first ever quick bowler that I saw was Javagal Srinath but again he was not in that league of fast men like Yadav, who can hit mid-90's.
"You have to know one thing, no one can teach you how to bowl fast and develop an aggressive attitude," Roberts sounded like a typical fast bowler, still gunning for an opposition batsman.
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"The kind of heavy bats that these guys use, I would have forced them to go for hook shots. I would have used the short ball more effectively. The kind of heavy bats they use, it's not easy to quickly get into position for a hook shot. But nowadays, even fast bowlers are trying to hit the length rather than bowl bouncers," he lamented.
"Variety is not about slowing up but also quickening up. I always see that for bowlers, the change-ups mean that delivering a slower ball. Why can't change of pace be if someone who is bowling around 88-90 mph increases it upto 95 mph.
"It's a sudden increase of pace and that's also a variation. It just can't be a batsman's game. Cricket is played between bat and ball and not just the 'Bat'," said the man, who Sunil Gavaskar had termed as the best fast bowler of his generation.