The total, which came off 536 balls and included 24 fours and two sixes, meant Sibley became Surrey's youngest-ever centurion, the second-youngest player to score a first-class century in England, and the 13th youngest first-class double-centurion in history.
Surrey director of cricket Alec Stewart said: "These are two highly promising young cricketers.
"We look to seeing them develop over the next few seasons."
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