Barry Geraghty and JP McManus started day three of Cheltenham with back-to-back winners, steering Defi Du Seuil to victory in the JLT Novices' Chase before Sire Du Berlais took the Pertemps Network Final Handicap Hurdle.
Defi Du Seuil scored his second Cheltenham Festival success as he got the better of old rival Lostintranslation.
Philip Hobbs' 2017 Triumph Hurdle hero, out of form throughout last season, has been a revelation over fences after a sticky start to the current campaign at this course.
Defi Du Seuil was also beaten by Lostintranslation in the Dipper Novices' Chase at Cheltenham on New Year's Day.
But having since gained revenge at Sandown, in the opening race on day three of the Festival, the six-year-old justified 3-1 favouritism under Barry Geraghty - pouncing on long-time leader Lostintranslation at the last and staying on to win by two and a quarter lengths.
Geraghty said: "They're two really good horses. Lostintranslation did me here a few months ago, we got it back at Sandown and the form has stood again. They are just two really good horses.
"I was banking on a big one at the last and he came up for me."
Geraghty produced another brilliant performance in the saddle to bag a double for himself and owner JP McManus as Sire Du Berlais landed a gamble as the 4-1 favourite in the Pertemps Network Final Handicap Hurdle.
Sire Du Berlais, trained by Gordon Elliott, rarely appeared to be going like a winner - but Geraghty threaded his way through a wall of horses from off the pace and then got the better of a duel with 40-1 outsider Tobefair up the run-in to prevail by a neck.
Geraghty, recording his 38th Cheltenham Festival winner, said: "I thought I was in trouble three out, I got tight for room but he rallied and rallied, and it was a good performance."