Mayur, after dropping the first set, trailed 0-3 in the second but staged a gritty fight back. Malik made unforced errors and Mohit kept the momentum to close the set and match.
Top seed Sriram Balaji after a sluggish start, rallied to find his rhythm and beat wild card Lakshit Sood 6-7(5), 6-2, 6-0.
Davis Cupper Sanam singh drubbed Arjun Khade 6-4, 6-0 while fourth seed and former National Champion Ranjeet V.M. beat Rakshay Thakkar 6-4, 6-0.
Sagar Manjanna was the third wild card to bow out losing to Michael Shabaz of the United States 4-6, 0-6.
First round singles results: Mohit Mayur V. bt Vijayant Malik 4-6, 7-6(5), 6-2, Michael Shabaz bt Sagar Manjanna 6-4, 6-0, V.M. Ranjeet bt Rakshay Thakkar 6-4, 6-0, Sriram Balaji bt Lakshit Sood 6-7(5), 6-2, 6-0, Sanam Singh bt Arjun Khade 6-4, 6-0.
Mumbai Indians won the toss and decided to bat against Sunrisers Hyderabad in their Indian Premier League match here Wednesday.