India entered the quadrennial extravaganza following a winless tour Down Under, losing the Test series and being knocked out early in the tri-series which had Australia and England as the two other participants.
"I think the team was mentally drained after playing the tri-series. The boys needed to recharge their batteries and freshen up for the World Cup. The break from cricket did them a world of good as they came all guns blazing when it was required. And frankly speaking, I believe that this tri-series that we played was sheer waste of time and energy," Shastri told PTI in an exclusive interview here.
"I am not at all surprised. In fact, why should I be surprised that the team has started on a magnificent note. I had complete belief in the boys and their abilities.
"It was a case of performing to their potential and that's exactly what has happened in the two matches against Pakistan and South Africa. If you ask me, the script went on expected lines," the former Indian captain said.
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"As far as I am concerned, I have never seen any Indian batsman perform better than Virat on Australian soil keeping Sachin Tendulkar and VVS Laxman in mind as they have done exceptionally well.
"I mean show me one Indian batsman who has scored four centuries in four Test matches. He has been phenomenal. He was dominant and that's the reason we carried the attack back to Australian camp in all the Test matches."
When asked if Kohli is destined to break all international batting records, he said, "I think that will be putting too much burden on one individual. He should be allowed to play freely and express himself in the best way possible.