LAHORE, Feb. 12 -- Mohammad Rizwan hammered a scintillating maiden ton as Pakistan defeated spirited South Africa by three runs in the thrilling first Twenty20 International of a three-match series at picturesque Gaddafi Stadium here on Thursday evening. Chasing victory target of 170, the Proteas could muster only 166 for the loss of six wickets in their allotted overs as the hosts' bowlers held their nerve to complete the thrilling win. The Proteas fell short of the target in the final ball of the innings. Needing 19 to win off the last over, Bjorn Fortuin (17 not out) and Dwaine Pretorius (15 not out) managed 15 as pacer Faheem Ashraf kept South Africa down to 166. Rizwan ran out the tourists' top-scorer Reeza Hendricks (54) in the 18th...