New Zealand snowboarder Tiarn Collins has claimed a second career World Cup victory after triumphing in the Czech Republic on Sunday morning (NZ time). The 22-year-old from Queenstown took out the latest round of the FIS Snowboard Slopestyle World Cup to catapult to top spot on the leaderboard with one event remaining in the season. FIS SNOWBOARDINGTiarn Collins, centre, celebrates his World Cup win alongside second-placed William Mathisen, left, and third-placed Luke Winkelmann. Collins, who last month finished 18th at the Winter Olympics, qualified through to the 16-man final second in his h…