Prithvi smashed an unbeaten 227 off just 152 balls to help Mumbai post a mammoth 457/4 against Puducherry.
Chasing a daunting target of 352, Railways were bowled out for 344.
Sanju has paid the price for not making the most of the limited chances that have come his way at the international level.
Rishabh Pant, who was dropped for the limited-overs series in Australia, has been rewarded for his consistent performances with the bat in red-ball cricket.
A total of 292 cricketers are set to go under the hammer on Thursday.
Sachin Baby will lead Kerala in the forthcoming Vijaya Hazare Trophy.
Pacer S Sreesanth is also part of the 20-member team.
The three final contenders based on the result of the first phase of SMS and online voting are: Nihal Sarin (chess), Chitharesh Natesan (bodybuilding), and Anish P Rajan (disability cricket).
The sportsperson with the maximum number of votes will receive the Manorama Sports Star 2019 award and a cash prize of Rs 3 lakh.
The Royals think tank will be hoping that Sanju can do what Shreyas Iyer has achieved for Delhi Capitals.