The right-handed batter, Prithvi Shaw, reached his second ton in very quick time, off just 129 deliveries.
The 23-year-old, opening the batting, faced just 153 balls, including 28 fours and 11 sixes as Northamptonshire piled up 415-8 en route to an 87-run win at Wantage Road.
Shaw's innings was the sixth highest individual score in any limited overs match, with only Ali Brown's 268 for Surrey against Glamorgan in 2002 a higher solo total in an English county match of this kind.
Long tipped for batting stardom after making a mammoth 546 in a single innings as a 14-year-old during a school match, the right-hander's first hundred runs Wednesday came off 81 balls with Shaw facing a mere 48 balls for his second hundred.
Shaw, who made a century on Test debut for India as an 18-year-old, comfortably surpassed Northamptonshire's previous highest limited-overs individual record score of 172 not out by former England batsman Wayne Larkins, made in a 40-over match back in 1983.
"We were not prepared for this," said a post on Northamptonshire's Twitter feed. "Prithvi Shaw has another List A double century! There are no words for how good this innings has been."
Shaw was eventually dismissed three balls from the end of the innings, caught at deep mid-wicket off seamer Danny Lamb.
This was the second time Shaw had made a double century in a domestic one-day match, following his unbeaten 227 for Mumbai against Puducherry in 2021.
Shaw has so far represented India in 12 matches across all three international formats — Tests, one-day internationals and Twenty20 matches — with the last of those appearances coming two years ago.
Highest individual scores in one-day games:
277 - Narayan Jagadeesan, Tamil Nadu v Arunachal, 2022
268 - Alistair Brown, Surrey v Glamorgan, 2002
264 - Rohit Sharma, India v Sri Lanka, 2014
257 - D'Arcy Short, Western Australia v Queensland, 2018
248 - Shikhar Dhawan, India A v South Africa A, 2013
244 - Prithvi Shaw, Northamptonshire v Somerset, 2023
The meme depicts the fan as being happy when Pakistan was 155/2. The meme then showed him going to the washroom and returning to see Pakistan getting all out.
Australia improved their rating from 113 to 118 following the annual update, maintaining a slender lead over Pakistan (116 points) and India (115 points).
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The former Pakistani captain, who has represented 19 teams in the T20 format, scoring 3,698 runs for the national side and 2,398 for the Kings, reached the milestone in 271 innings as opposed to Gayle who achieved the feat in 285 innings.