Karl Te Nana: Super Rugby semifinals preview - Crusaders, Blues, Chiefs & Brumbies

New Zealand sevens legend and Sky Sport rugby commentator Karl Te Nana joins Martin Devlin on It's Only Sport, looking ahead to the two Super Rugby Pacific semifinals this weekend. The Crusaders host the Blues in the first clash in Christchurch on Friday night, before the Chiefs entertain the Brumbies in Hamilton on Saturday. Karl shares his thoughts on how the Blues can beat an injury-hit Crusaders side despite history being against them, whether or not we should be concerned by the Chiefs' narrow win over the Reds a week ago, and more.