The day and night affair at the Wankhede Stadium could not start at scheduled 2.30 pm as the clothings arrived from Bangalore 15 minutes later at 2:45.
Earlier, India Seniors captain Sourav Ganguly won the toss and elected to bat against the Rahul Dravid-led team in the first match of the three-team tournament.
The Seniors left out Irfan Pathan while the 'A' team ignored Robin Uthappa.
The match will see the return of Lakshmipathy Balaji to action after a long break from from the game due to an injury.
India Seniors:Sourav Ganguly (Capt), M S Dhoni (WK), Yuvraj Singh, Suresh Raina, Venugopal Rao, Neeraj Patel, Anil Kumble, Lakshmipathy Balaji, Gagandeep Singh, Rajesh Pawar, Shikhar Dhawan.
India 'A':Rahul Dravid (Capt), Dinesh Kaarthick (WK), Satyajit Parab, Dhiraj Yadav, Mohammad Kaif, Dinesh Mongia, Murali Kartik, Ajit Agarkar, Zaheer Khan, R P Singh, Yousuf Pathan.