Rugby league mastermind Jason 'Costo' Costigan joins Martin Devlin on It's Only Sport as he does every Friday, where he goes through all the NRL games on this weekend and offering his expert analysis and picks. The Warriors travel to Canberra to take on the Raiders in Jarrod Croker's 300th NRL match, while the Sydney Roosters play the Penrith Panthers and Melbourne Storm entertain the Cronulla Sharks in a couple of other big tussles. This week Costo also talks about selection conundrums for New South Wales ahead of State of Origin game two.