LUCKNOW, Oct. 7 -- India extended their winning streak in home T20 internationals since their World Cup triumph in March as skipper Shreyas Iyer struck his first century in the format to help beat West Indies by eight wickets in the opener of the five-match series here on Tuesday. Shreyas struck an unbeaten 102* with Ishan Kishan (37*) for company as India, chasing a target of 172, were home in 14.4 overs. It was India's 21st win in 32 matches against the Windies. Sanju Samson, picked to open ahead of young Vaibhav Sooryavanshi, fell for 11 after the World Cup final's player of the match mistimed his shot to be caught and bowled by left-arm spinner Akeal Hosein. In the two matches at the Asian Games, Samson made just nine runs. The run chase never looked difficult at the Atal Bihari Vajpayee Ekana Cricket Stadium. Debutant Naman Dhir's 3/31 bowling spin restricted the visitors to a moderate score. Shreyas and Kishan added an unbroken 137 for the third wicket. Both hammered the Windies bowlers all around the ground as over 48,000 fans watched, after guiding India to 62/2 in the Powerplay following the dismissals of Abhishek Sharma and Samson in quick succession. Shreyas shook off a lean patch since taking over as captain from Suryakumar Yadav in June. His unbeaten 102 came off just 43 balls (10x4, 6x6). Kishan's 37 came off 27 balls with five hits to the fence. Naman Dhir made a standout T20I debut, claiming 3/31- third-best bowling figures by an Indian on debut - as India bowled out West Indies for 171. Brief scores: West Indies 171 in 19.1 ovs (Shai Hope 52, Sherfane Rutherford 56, Axar Patel 2/26, Kuldeep Yadav 2/33, Naman Dhir 3/31). India 172/2 in 14.4 ovs (Ishan Kishan 37*, Shreyas Iyer 102*). India won by 8 wkts....