First Cricketer To Score A Century On ODI Debut.

Dennis Amiss of England scored 103 runs in his debut One Day International match against Australia on 24 August 1972. He is thus the first batsman to score a century on his ODI debut. He is also the first ODI centurion

Dennis Amiss in Full Flow
Brief Match Stats: The match, only the 2nd ODI in history, was played at Old Trafford, Manchester. England won the and asked Australia to bat first. Australia put up 222 runs on board for the loss of 8 wickets from their full quota of 55 overs. 

England managed to chase down the target in 49.1 overs for the loss of 4 wickets thanks to a splendid batting display by Dennis Amiss, and won the match by 6 wickets.