There was not much suspense hanging over chief selector M.S.K Prasad's news conference to announce a 15-member squad led by Virat Kohli as most of the players picked themselves.
With Mahendra Singh Dhoni the undisputed first-choice wicketkeeper, the selectors preferred Karthik's experience to the raw aggression of 21-year-old Pant.
"We felt Rishabh Pant or DK will come into the playing XI only if Mahi (Dhoni) is injured," Prasad told reporters, saying Karthik's superior keeping and reputation as a "finisher" clinched it for the 33-year-old.
"In crunch matches, who can be the best guy who can handle the pressure? For that reason, the decision went in favour of Dinesh Karthik. Otherwise Pant is full of talent, there'll be time for him. It's unfortunate for him that he missed out."
There were also speculation about who India pick as their number four batsman and Shankar pipped Rayudu.
"What Vijay Shankar offers is three dimensional," Prasad said.
"Apart from his batting, he can bowl and he's a fantastic fielder...We are looking at him as number four. We have Dinesh Karthik and Kedar Jadhav also, so we have plenty of options at number four right now."
Lokesh Rahul made the squad as a back-up opener, but could also bat at number four, Prasad said.
The World Cup in England and Wales starts on May 30.
Squad: Virat Kohli (captain), Rohit Sharma (vice captain), Shikhar Dhawan, Lokesh Rahul, Vijay Shankar, Mahendra Singh Dhoni(wicketkeeper), Kedar Jadhav, Dinesh Karthik, Yuzvendra Chahal, Kuldeep Yadav, Bhuvneshwar Kumar, Jasprit Bumrah, Hardik Pandya, Ravindra Jadeja, Mohammed Shami
(Reporting by Amlan Chakraborty in New Delhi; editing by Ken Ferris and Ed Osmond)
