cardiff's principality stadium — wherejoshua staged his most recent victory against french challenger carlos ta kambecoming the first undisputed heavyweight champion of the world since lennox lewis in 1999. there's been a shock in snooker‘s masters event, with world number one mark selby being knocked at the first—round stage. he was beaten in the deciding frame by mark williams at alexandra palace in london. to discuss that, and look ahead to this evening's match between luca brecel and mark allen, here's the bbc‘s jason mohammed, with steve davis and ken doherty. 0pening day, what a match? opening day, what a match? mark williams got off to a flying start, it looked like he dominated, but marketing back so strong, it looked like he would run over the line quite easily, until that horrible kick. it change the whole match. a great match from both players, high quality. that was the pivotal moment for mark selby when he had the chance to get in the quarterfinals, that bad kick, misfortune. then mark williams never looked back. a fantastic start. you have to give huge credit to mark williams and not