Datt and Verma were promoted from the qualifiers to the main draw of the men's singles after the withdrawal of the players on the deadline of April 20.
Four other Indians -- Sumit Reddy, Rohit Yadav, Nand Gopal Srikanth, K Srikant -- were promoted from reserve to qualifiers of the men's singles event.
Top Indians Chetan Anand and Arvid Bhat were among the 12 players who had withdrawn from the men's singles.
In women's singles, Mohita Sachdeva and Tripti Murkunde were also promoted from reserve to qualifiers after withdrawal of players.
In men's doubles, the Indian pairs of B Sumit Reddy and T Heman Nagendra Babu and Beneth Anthony and P H Suraj were promoted from the qualifiers to the main draw.