Defending champions India sailed into the quarterfinals with five wins on the trot, including convincing victories against Pakistan and South Africa.
"India are peaking confidently. They have lifted their energies well. Whether they have enough fast, accurate swing will be the key, as Mohit Sharma, Mohammed Shami and Umesh Yadav can go walkabout," Crowe wrote in a column for 'ESPNcricinfo'.
The former New Zealand captain added, "So far they have gelled with their leader and are flowing along smoothly. Their ability to take enough wickets in the semi-final, possibly against Australia, will be the one single factor to decide India's fate."
He called Australia the most power-packed side competing in the mega event.
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"Australia are the most equipped, power-wise. They are a spirited bunch of fit, fiery macho athletes, looking much better now that their touch player and mastermind is rightly steering the ship.
"I've said it before and will repeat it here: courageous leadership will win this tournament, and Michael Clarke is my greatest fear, from a trans-Tasman viewpoint, if a down-under showdown takes place in Melbourne. Most pressing for him, too, will be to work out his fifth-bowler combo."
South Africa is another team Crowe hoped to see in the semifinals.