Shane Lowry produced some of his best golf to beat Carl Pettersson 6 and 5 in Tucson and set up a last 16 meeting with close friend Graeme McDowell. Picture: Fran Caffrey / www.golffile.ieShane Lowry overcame a restless night following his shock win over Rory McIlroy to crush Carl Pettersson 6 and 5 and set up a dream last 16 clash with pal Graeme McDowell in the WGC-Accenture Match Play Championship in Tucson.