Touted as one of the bright young prospects emerging out of Mumbai school of batsmanship, the state U-16 captain Prithvi hit 85 boundaries and five sixes in the match played at the Azad Maidan.
In the process, Prithvi became the first schoolboy cricketer to hit a 500 plus score in an official inter-school match.
"I am feeling good. It is a good score for me and my team. Our coach just asked me to concentrate on every ball. The only plan was to score as many runs as we could. I want to continue like this in future also," the youngster said.
Having bowled out St Francis for 92, Prithvi was unbeaten on 257 off 166 balls yesterday and smashed another 289 runs on the day.
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It was Harris Shield, which first brought Sachin Tendulkar into national prominence after his world record partnership of 664 with Vinod Kambli that was broken a few years back.
The previous highest by an Indian in any form of registered competitive cricket is 515 by Dadabhoy Havewala for BB and CI Railway vs St. Xavier's College at Mumbai during 1933-34 season.