Stephen Hendry is at a loss as to who can stop Ronnie O'Sullivan on his quest to win a record-breaking eighth World Snooker Championship.
Hendry and O'Sullivan are currently tied on a record seven titles each but the Rocket is well set to challenge again at the Crucible next month.
O'Sullivan has already won five tournaments this season, including the first two Triple Crown Events at the UK Championship and the Masters.
He recently won the inaugural Riyadh Season World Masters of Snooker in Saudi Arabia, scooping a cool £250,000 in prize money.
Stephen Hendry is at a loss as to who can beat Ronnie O'Sullivan
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O'Sullivan has been able to keep up top form despite reducing the number of tournaments he enters.
Hendry welcomed Neil Robertson onto his latest video on his Cue Tips YouTube channel.
And the Scot admitted to the Aussie that he was in a quandary as to who could stop O'Sullivan from winning again in Sheffield.
Hendry said: "For me, looking at the other side. Who’s going to stop him (O'Sullivan)?
"If you’re not at your best, if Judd [Trump]’s not, who’s going to stop him?"
The 2010 world champion Robertson is not scared of O'Sullivan but says the Rocket's own mindset is the only thing that can stop him.
Robertson replied: "He’s had an unbelievable season. I’m probably the type of character who wouldn’t be scared of him in that sense.
"I think once he gets down to the quarters or semis, before then he can lose to anyone in the field, but when he gets down to the quarters or semis then the amount of people who could actually beat him in a semi-final comes down to a handful at best.
"It just depends on him, if his mindset is really good. We saw in his documentary what he goes through. A lot of it really does depend on him."
Robertson has had a relatively poor season by his own standards but is attempting to finish on a high.
He says he still watches O'Sullivan's matches closer than any others to pick up tips.
Robertson added: "I don’t watch all the tournaments, if I think it’s a good match with Ronnie and Judd playing or John [Higgins], [Mark] Selby, anything I think could be an interesting match I might tune in and watch a bit of it.
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Stephen Hendry and Neil Robertson discussed how you can beat Ronnie O'Sullivan
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"But I won’t watch a match just for the sake of watching snooker.
"I think Ronnie and John are the two that still can be educational. Just trying to predict what they’re going to play and then see what they do play.
"From Ronnie’s perspective, how he just never plays scrappy frames, obviously that’s a big one for me. If I can avoid the scrappy frames there’s not many players who can beat me."
Hendry says the secret to O'Sullivan's success is being able to pot easy balls on a consistent basis.
Ronnie O'Sullivan is aiming to win all three Triple Crown events in a season for the first time
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He said on the WST's Snooker Club podcast: "When he’s at his best, as he was against Higgins in Saudi Arabia and against Ding [Junhui] in the Players [Championship], he just never misses.
"Obviously his cue ball control is better than anyone else’s. The thing with Ronnie, if you watch Ronnie through a season, he very, very rarely misses anything easy. He always pots the balls he’s supposed to pot.
"I say many times in commentary, it’s the easy shots that find you out. A lot of the other players do miss easy balls now and then and Ronnie never seems to. That’s the secret."