A new "unreturnable" spin-serve has caught the attention of the world's top badminton players and the Indian doubles shuttlers are also not far behind as they are putting in the hard yards to master this latest skill, which many believe can give "unfair" advantage to the players. Ever since Danish doubles player Marcus Rindshoj accumulated a bunch of points with this innovative spin serve at the Polish Open last month, it has become a rage in international badminton with players across the globe trying their hand to learn this new trick.
