Ronnie O’Sullivan holds narrow lead over Ali Carter in World Snooker Championship

O’Sullivan leads 5-4 on his return to competitionBoth players compile centuries in tight opening sessionRonnie O’Sullivan had to settle for a single-frame overnight advantage as the opening session of his World Snooker Championship first-round clash against his old foe Ali Carter failed to live up to its pre-match hype.The seven-time champion, returning to the tour for the first time since dumping his cue after losing a Championship League match in January, looked to have scrapped ou