Ronnie O'Sullivan led 8-3 and 9-4 but lost 13-12 in an epic last-16 tie against John Higgins
Former world champion Neil Robertson has called for a controversial chalk used by Ronnie O'Sullivan to be banned, saying most other players "hate it" and that it "makes an absolute mess of the table".
O'Sullivan, 50, is one of only a handful of players on the World Snooker Tour (WST) to still use the traditional Triangle Chalk.
Critics say it causes more poor contacts, leading to 'kicks' when the cue ball hits the object ball, often resulting in players running out of position or missing pots.
Almost all players use Taom Chalk, which reduces kicks and leaves no marks on the table.
