The hosts trailed New Zealand by 149 runs at the close of a fast-paced day one at Mumbai's Wankhede Stadium, where the pitch has offered turn to the spinners.
"Everything that happened today was pleasing," said off-spinner Sundar after taking 7-59.
India were 16-1 at the close in Pune, losing captain Rohit Sharma for a nine-ball duck to a Tim Southee delivery that shaped away and crashed into the off-stump via the pad.
India captain Shubman Gill led his team to what he described as a "crucial" 23-run win in the third T20 international against Zimbabwe at the Harare Sports Club on Wednesday.
The hosts trailed New Zealand by 149 runs at the close of a fast-paced day one at Mumbai's Wankhede Stadium, where the pitch has offered turn to the spinners.
"Everything that happened today was pleasing," said off-spinner Sundar after taking 7-59.
India were 16-1 at the close in Pune, losing captain Rohit Sharma for a nine-ball duck to a Tim Southee delivery that shaped away and crashed into the off-stump via the pad.
India captain Shubman Gill led his team to what he described as a "crucial" 23-run win in the third T20 international against Zimbabwe at the Harare Sports Club on Wednesday.