Harjas Singh has produced one of the most incredible knocks in the history of grade cricket, blasting a triple-century for Western Suburbs in a one-day game.

The youngster, who previously played for the Australian U19s team, finished with 314 from just 145 deliveries in the limited-overs clash with Sydney.

In the process, he shattered a stack of records going back more than a century.

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Singh’s 35 sixes is the most in the history of NSW Premier cricket, while his stunning knock is the highest score ever in a 50-over first grade game.

Harjas Singh celebrates his century Cricket NSW

It’s also the third-highest score in the history of the competition behind only Victor Trumper in the 1902/03 season and Phil Jacques in the 2006/07 season.

Wests finished with 5-483 in the first innings at Pratten Park.

Singh featured in the U19s World Cup last year but was left without a state contract last year after being overlooked by NSW.

His performance for Wests may have plenty within the organisation turning their heads.

Pathways coach Anthony Clark told cricket.com.au earlier this year that the 20-year-old has all the tools to have a successful career.

“He’s a big boy and you could see he’s worked really hard on his fitness when he was by himself. He’s a lot stronger and he’s a lot leaner now,” Clark said.

“You speak to him now, and I think he’s got a greater appreciation for (knowing) ‘I’m on the outside, but I know if I work hard that I’ll get there.'”