The 22-year-old Kumar had career-best figures of 4 for 8 runs in six overs as Sri Lanka were bundled out for a paltry 96 in 24.4 overs in pursuit of 178 in stipulated 26 overs as Virat Kohli, in his maiden stint as captain, guided the 'Men In Blue' into the title round. India will again meet Sri Lanka in the final at the same venue on Thursday.
Put into bat, Rohit Sharma contributed 48 as India reached 119 for three in 29 overs when rain halted proceedings. Courtesy Duckworth-Lewis method, Sri Lanka's target swelled upto 178 in 26 overs.
For India, the magic figure was 167 under which they had to restrict the islanders in order to make it to the summit clash.
Kumar's knack of picking up early wickets reaped dividends for India as he rocked the opposition removing Upul Tharanga (6) and Kumar Sangakkara (0) off successive deliveries. Tharanga got one that shaped away after pitching as he edged one to Suresh Raina stationed at wide second slip.
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If that wasn't enough, Mahela Jayawardene (11) was also dismissed cheaply to make it 27 for three. Jayawardene slashed hard at a rising delivery only to be holed at third man where Murali Vijay was stationed.
Kumar soon got his fourth wicket when Lahiru Thirimanne (4) offered a simple catch to Virat Kohli at cover as Lanka looked down and out at 31 for four.
The manner which the young UP lad swung the ball under overcast conditions was a treat to watch. He bowled those beautiful outswingers which Dinesh Chandimal (26, 54 balls) played and missed repeatedly with an occasional one coming into the right-hander.