India wonderkid Vaibhav Sooryavanshi scored a maiden Twenty20 international half-century in a seven-wicket victory over Zimbabwe in Harare.Put in to bat after losing the toss on Thursday in the first of three matches, Zimbabwe made a meagre 125-7 in 20 overs with all-rounder Wessly Madhevere (39) top-scoring.Led by 15-year-old prodigy Sooryavanshi, who struck four sixes and four fours in an 18-ball 50, India cruised to 126-3 with 40 balls to spare.Sooryavanshi became the youngest cricketer to represent India by debuting in a 4-0 T20I drubbing by England this month. He scored 42 runs in three innings.After his whirlwind 50 in Harare, Sooryavanshi was out when he got a thick outside edge to a Richard Ngarava delivery and was caught at deep third man by Ben Curran.He departed with the tourists 68-2. Then, wicketkeeper Ishan Kishan (35) and unbeaten captain Shreyas Iyer (28 not out) ensured India ended a dismal recent T20I run.Before four losses in England, one by an Indian record 125 runs, the reigning T20I world champions lost another series 2-0 in Ireland.Victory at Harare Sports Club was a welcome relief for Iyer it ended a seven-match winless run since he inherited the captaincy.I think the boys were tremendous. Could not have been happier with my first win, the skipper told reporters.There was bounce from a good length and it was also variable. I felt it was there in both innings. We are going to play two more matches here, so this performance gives everyone some confidence.Madhevere was run out after a 58-run sixth-wicket stand with Tadiwanashe Marumani (27 not out). An unwise attempt to secure a second run led to his downfall.