Marcus Stoinis smashed an unbeaten half century and grabbed three wickets as Australia opened their T20 Cricket World Cup campaign with a comfortable 39-run Group B victory over Oman on Wednesday. Stoinis conjured a game-changing 67 not out off just 36 balls to power Australia to 164-5 at Kensington Oval and then got among the wickets as Oman were restricted to 125-9 in reply.