India, June 22 -- Vaibhav Sooryavanshi did not merely play a stunning innings in the Tri-Nation A Series final. He added another entry to a pattern that is becoming harder to dismiss.

The bigger the match gets, the more dangerous he seems to become.

On Sunday, in the final against Sri Lanka A in Dambulla, the 15-year-old left-hander smashed 94 off just 29 balls, with 10 fours and eight sixes, as India A posted 377/9 and went on to beat Sri Lanka A by 66 runs to lift the title. His fifty came off only 11 balls, the fastest half-century in List A cricket, but the larger story was not merely the speed of the innings. It was the timing of it.

This was a final. This was after a tournament where he had not fully dominated the league stage. T...