India's Ramukumar Ramanathan defeated New Zealand's Finn Tearney as India took an unassailable 3-1 lead over New Zealand in the Davis Cup Asia/Oceania Group I first round tie In Pune today.Ramkumar cruised to a 7-5, 6-1, 6-0 win over the Kiwi opponent in exactly two hours in windy conditions. Ramkumar, who had won his singles rubber on day one against Jose Statham in straight sets in very impressive fashion, clinched a closely fought 51-minute first set.Tearney's game went to pieces thereafter as his rival seized on the opportunities and ran away with the second and third sets with two and three breaks of serve each to propel India into the second round for a meeting with Uzbekistan from 7th to 9th April.Uzbekistan got past South Korea in another first round away tie. India had taken a 2-0 lead on the first day when Yuki Bhambri and Ramkumar clinched their singles rubbers against Tearney and Statham respectively.New Zealand clinched the doubles rubber yesterday when Artem Sitak and Michael Venus got the better of Indian veteran Leander Paes and Vishnu Vardhan.