While Zol's knock came off 120 balls laced with seven fours and two sixes, Samson took just 87 deliveries for his ton that included eight boundaries and four sixes, to help India reach 314 for eight in their allotted 50 overs.
In reply, Pakistan could reach 274 for nine, despite a fighting ton from Kamran Ghulam (102 not out; 89b, 12X4s).
Put in to bat, India got off to a solid start with openers -- Ankush Bains (47) and Akhil Herwadkar (12) -- putting on 65 runs in 6.4 overs for the opening wicket.
However, Zol and Samson joined hands to share a massive 180-run partnership for the third wicket to give India the upperhand.
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The two batsmen kept on rotating the strike well by taking singles, but punished any loose deliveries that came their way to frustrate the Pakistani bowlers.
Karamat finally broke the partnership when he saw off Zol, who mistimed a shot and lofted it to Zafar Gohar at mid-on.
But Samson took the revenge by hitting Karamat for two consecutive sixes in the next two deliveries. He, however, failed to sustain for long and got out a couple of overs later.