NIAMEY, Jumada II 11, 1437, March 20, 2016, SPA -- Niger voted on Sunday in a presidential run-off which incumbent President Mahamadou Issoufou is heavily favoured to win, Reuters reported Issoufou won the first round comfortably last month with 48 percent of votes but failed to clinch the outright majority required to avoid a second round. Voting officially opened at 7 a.m. (0700 GMT). --SPA 12:32 LOCAL TIME 09:32 GMT www.spa.gov.sa/w