Opening batsman Tim Seifert’s blistering 88 helped New Zealand defeat Sri Lanka by four wickets in their thrilling third and final Twenty20 international in Queenstown on Saturday to complete a 2-1 series victory. Seifert’s brutal assault on Sri Lanka’s bowlers during his 48-ball knock included 10 fours and three sixes as New Zealand cruised for much of their chase of 183, but a dramatic final over when three wickets fell ensured a nervy finish.