Bachasson continued his rise through the ranks uner Willie Mullins with another impressive success at Galway.
Ruby Walsh was happy to let Rocky Court bowl along in front before easily moving to his heels going to two out on the favourite that was sent off at odds of 1/6 having last been seen winning at the big festival meeting at Ballybrit in July.
The Mullins-trained hotpot pinged the last with a narrow advantage and soon cantered clear for a six-length success to take his record in Ireland to three from three and cement his position as a leading early candidate for the Supreme Novices' Hurdle.
Patrick Mullins, representing his father, said: "He did what we expected him to do. Ruby didn't extend him and minded him coming down the hill. There's a novice hurdle at Listowel, but that might come too soon for him."
Walsh said: "I was a bit more impressed with him today than the last day and he quickened up smoothly. He's doing everything we've asked him to do, but they are summer novice hurdles and there's a big step up to Graded company and a bigger one to Grade One.
"The dream is still alive, though, and we'll find out soon enough (how good he is). There are novice hurdles on Arc day at Tipperary and on Munster National day at Limerick in October for him."
Rock The World was all heart when getting the better of The Game Changer in the Grade Three Ballybrit Novice Chase.
Having taken them along from the outset, the 11/10 winner looked in trouble when The Game Changer came to challenge him, seemingly full of running.
However, Rock The World was not for passing and produced a gutsy response on the run-in and eventually saw off his rival by two lengths.
Jockey Barry Geraghty said: "He looked beaten but battled well and pulled it out when it was needed. He'll get further and jumps great."
Flat recruit Tetraites brought up the first leg of a double for Walsh when making a winning hurdling debut in the opening O'Leary Insurances Maiden Hurdle.
The 11/8 victor was always in the box seat and never looked in any real danger as he stretched clear on the run-on to score by nine lengths.