KINGSTOWN, St Vincent – West Indies Under-19s produced a sterling effort to beat South Africa Under-19s by 19 runs here Monday, successfully defending a paltry 126 to tie their four-match Youth One-Day International series 2-2 at Arnos Vale Stadium.Fast bowler Johann Layne knocked over the first three wickets to finish with three for 34 while left-arm spinner Jaden Carmichael (3-14) and seamer McKenny Clarke (3-23) followed up with three wickets hauls to send the visitors crumbling for 107 in the 24th over.Only last man Aphiwe Mnyanda with 20 from 21 balls managed to pass 13, and it was his knock, inspiring a 33-run, 10th wicket stand with Asakhe Tshaka (11 not out), which threatened West Indies Under-19s at the end.