Almost the bonus-point score already for Toulouse.
In the same corner where he squeezed home for the first, this time Lebel just runs out of room.
Ulster knock-on when trying to clear, however, and Toulouse have the scrum about eight metres out.
Emmanuel Meafou (con Thomas Ramos)
You can't take your eyes off this one and we've a fourth try in the opening quarter of an hour.
There's been plenty for forwards enthusiasts to enjoy so far with Toulouse's power game in the tight exchanges giving them a real advantage.
Their third is off the line-out once again, with Emmanuel Meafou the one to crash over on this occasion.
Image source, InphoToulouse 12-7 Ulster
Andy Gray
BBC Sport NI at Stade Ernest-Wallon
My word, this has been a boring start.....
Toulouse have been electric going forward, but that's a good response by Ulster.
James McCormick (con Nathan Doak)
And the try will stand!
The referee couldn't quite see the grounding but with the on-field decision of try, there was nothing to overturn the score and Ulster are back in this.
Exactly the response they needed after shipping those two early tries.
Toulouse 12-0 Ulster
And Ulster think they're over!
James McCormick drives for the line and we'll go upstairs to see if he got it down.
Toulouse 12-0 Ulster
Richie Murphy's side have a chance to get back into things with Toulouse pinged for not rolling away.
They'll go for the tap penalty.
R Ntamack (con Ramos)
Toulouse have their second.
From that penalty, the maul drives forward before being halted just short.
With Ulster expecting Dupont to go short to the oncoming forward, he pulls it out the back for half-back partner Ntamack who evades Ben Carson on his way over the line.
Toulouse 5-0 Ulster
Toulouse have got their maul going on a couple of occasions already so far.
They win a penalty here and Ntamack gives it a huge nudge to the five metre line.
Toulouse 5-0 Ulster
Ulster try to respond quickly, winning a penalty which Aidan Morgan knocks to the corner.
The line-out is overthrown, however, and a big chance goes begging.
Matthis Lebel
It only took 90 seconds...
Ulster were under pressure in their own corner off the kick-off with Nathan Doak's touchfinder giving Toulouse a chance to attack off the line-out.
From there, it was all too easy with Toulouse working the ball from right to left with Matthis Lebel finishing strongly in the corner.
The hosts can't add the conversion but what a start to their title defence from the holders.
Image source, InphoMatthis Lebel scores a try despite Stewart Moore's efforts
Toulouse 0-0 Ulster
Romain Ntamack gets us underway at the Stade Ernest-Wallon.
How will Ulster fare against the star-studded holders?
Toulouse v Ulster (15:15 GMT)
Image source, InphoToulouse fans ahead of the game
Toulouse v Ulster (15:15 GMT)
In this 30th season of European action, this will be the 15th time that Toulouse and Ulster have met in the various guises of this competition.
Toulouse have just got the better of things, winning seven, losing six and drawing one of the previous meetings.
The French side came away 48-24 winners at Kingspan Stadium in January with Ugo Mola's side running in seven tries in the win.
The most famous head-to-head, however, came during the 1998/99 season when Ulster won 15-13 in the quarter-finals on their way to being crowned Irish rugby's first European champions.
Image source, Getty ImagesUlster played Toulouse three times during their victorious 1998/99 campaign
Toulouse v Ulster (15:15 GMT)
Ulster certainly face a huge challenge this afternoon but their scrum-half Nathan Doak is excited by the prospect.
"This is why you play – you’re playing against Toulouse and against Dupont – it’s just something that you want to be a part of," said Doak.
"It’s a big challenge but something we are looking forward to."
Image source, Getty ImagesNathan Doak's opposite number will be former world player of the year Antoine Dupont
Toulouse v Ulster (15:15 GMT)
Andy Gray
BBC Sport NI at the Stade Ernest-Wallon
Image source, BBC SportWe may be in the south of but it's very much woolly hat and gloves weather.
There's been a gentle drizzle all day to spice things up as the players warmed up (as much as they can!).
The home made some racket as the teams got off their respective coaches, and many have got into the ground early to get a close-up glimpse of Dupont and his star-studded team-mates.
It's going to be a huge ask for a young Ulster side.
Toulouse v Ulster (15:15 GMT)
Ulster captain Iain Henderson, who starts among the replacements this afternoon, has been speaking to Premier Sports before his side get underway against Toulouse.
On the challenge of facing the holders in their opener: "The team we're playing is exceptional, unbelievable at home.
"It's going to be a huge challenge for us, we have to go out and attack the game."
On making an impact off the bench: "We want to be coming on and doing what we know we can do well. It's making sure we can add a bit when we come on and hopefully continue a big performance."
Image source, Getty ImagesToulouse v Ulster (15:15 GMT)
Toulouse: Ramos; Capuozzo, Barassi, Chocobares, Lebel; R Ntamack, Dupont (capt); Ainu'u, Mauvaka, Aldeheri; Flament, Meafou, Willis, Banos, Roumat
Replacements: Marchand, Neti, Merkler, T Ntamack, Graou, Costes, Mallia
Ulster: Moore; Kok, Carson, McCloskey, Lowry, Morgan, Doak; Warwick, McCormick, Wilson; O'Connor (capt), Sheridan; Matty Rea, Marcus Rea, McNabney
Replacements: Herring, O'Sullivan, O'Toole, Henderson, Izuchukwu, Shanahan, Postlethwaite, Timoney
Image source, InphoAlan O'Connor, Adam Leal and Antoine Dupont during the coin toss
Toulouse v Ulster (15:15 GMT)
With Ireland having played their final autumn fixture against Australia last weekend, Ulster head coach Richie Murphy has opted to keep most of his Test players in reserve.
Iain Henderson, Rob Herring, Tom O'Toole, Nick Timoney and Cormac Izuchukwu are all named among the replacements, although Stuart McCloskey starts in midfield.
For holders Toulouse, there is no Blair Kinghorn in the matchday 23 but plenty of stars will be on show.
Antoine Dupont starts at nine and is ed in the backline by the likes of Thomas Ramos, Ange Capuozzo, Santiago Chocobares and Romain Ntamack.
Line-ups are next up.
Image source, InphoIain Henderson arrives at Stade Ernest Wallon
FT: Bordeaux Begles 42-28 Leicester Tigers
It's the return of the champions up next as Toulouse take on Ulster.
We'll have the build-up to that one next...
Bordeaux showed all of their class to blitz past Tigers at the start of the second half but Leicester will return home with a try-scoring bonus.
