High Quality Content by WIKIPEDIA articles! The World Open is a professional ranking snooker tournament. It has previously been known as the Professional Players Tournament, the LG Cup and the Grand Prix. During 2006 and 2007, it was played in a unique round-robin format, more similar to association football and rugby tournaments than the knock-out systems usually played in snooker. The knock-out format returned in 2008 with an FA Cup-style draw.