Craig Casey is confirmed as man of match shortly after his game-sealing try.

Munster had a crack for what would have been the bonus-point score with the final play - new laws this season in Europe, remember - but to no avail.

Still, that's a big win to kick things off for the southern province, especially after their uneven start in the URC.

Well, those replacements certainly injected some life into the Racing cause.

Having barely troubled the Munster line, the visitors have crossed twice in the space of seven minutes.

First wing Wilfried Hulleu scored a try from nowhere and then Maxime Machenaud scored off a close-range maul.

To be clear, that's not a typo. Scrum-half Machenaud, for reasons unclear, not only found himself in a maul but scored off one too.

In tribute to Anthony Foley, neither side has taken the field with a player wearing the number eight in Cork this evening.

And it was the hosts' number 24 for the evening that has set them on their way here with Brian Gleeson crashing over off the base of the scrum.

Shay McCarthy has since followed him over the line with Charlie O'Shea converting both scores on his Champions Cup debut.

Antoine Gibert had previously kicked an early penalty for the visitors, who now trail 14-3.

Munster: O'Connor; McCarthy, Nankivell, Kelly, O'Brien; O'Shea, Casey; Loughman, Van der Merwe, Aungier, Ahern, Beirne (capt), Edogbo, Hodnett, Gleeson.

Replacements: Clein, Wycherley, Brookes, Wycherley, Coombes, O'Donovan, Hanrahan, O'Donoghue.

Racing 92: Prisciantelli; Hulleu, Habosi, Manu, Tupou; Gibert, Latrasse; Jabea Njocke, Escobar, Kharaishvili, Lainault, Joseph, Tagitagivalu, Martins, Baudonne (capt).

Replacements: Basse, Leota, Bamba, Hughes, Camara, Machenaud, James, Roche.

In the other 13:00 BST kick-off, Bulls scored eight tries in a convincing 56-20 victory against Stade Francais.

Cheswill Jooste ended with a hat-trick of tries, having crossed for his first inside 20 seconds, as the South African side clinched a bonus-point win.

This was the first match to be played in Pool Four, which also contains Bath, Northampton, Cardiff and Montpellier.

Bath host Montpellier at 20:00 BST and we will have live text and radio coverage of that game later on this page.

Leinster are back in front and it's a lovely try.

After Jack Conan stops a Clermont attack, Sam Prendergast breaks through the heart of the hosts and kicks to Jimmy O'Brien, who punts the ball forward, collects and feeds it back to Prendergast for the fly-half to run in under the posts.

He converts his own score and Leinster lead by six.

Stormers: Willemse; Senatla, Simelane, Roche, Zas; Feinberg-Mngomezulu, Reinach; Matongo, Kotze, Sandi, Smith, Schickerling, De Villiers (capt), Kolisi, Roos.

Replacements: Venter, Mchunu, Porthen, Evans, Norton, Fourie, Pead, Gelant.

Bristol: Wilson; Pepper, Moroni, Bates, Boshoff; Worsley, Marmion (capt); Woolmore, Gwilliam, Halliwell, Rubiolo, Caulfield, Owen, Jenkins, Ivanishvili.

Replacements: Moody, Turner, Scott, Wells, Pearce, Harris, Williams, Worsnip.

In the other 13:00 BST kick-off, South African side Bulls are in control against French club Stade Francais.

Cheswill Jooste went over for the hosts after just 20 seconds and they have scored two further tries in the first half.

Stade Francais have replied with a couple of penalties but they trail by 15 points at the interval.

Bath, Northampton, Cardiff and Montpellier are also in this pool.

Alex Sanderson makes five changes to the Sale side that beat Harlequins last weekend.

Tomas Francis makes his first start for the club, while flanker Ben Curry features from the start for the first time this term.

England winger Tom Roebuck is back from a calf strain, Rekeiti Ma’asi-White returns after a knee problem and Luke Cowan-Dickie replaces Nathan Jibulu at hooker.

Meanwhile, Glasgow have made eight changes, including first appearances of the season for captain Kyle Steyn, prop Zander Fagerson and lock Alex Craig.

Ruwald van der Merwe makes his club debut at number eight having signed from Pumas in the summer.

Only Nathan McBeth, Scott Cummings and Rory Darge retain their places in the forward pack that started the URC win over Connacht last time out as Seb Stephen starts at hooker and the fit-again Euan Ferrie comes into the back row.

Head coach Franco Smith sticks with the half-back pairing of George Horne and Dan Lancaster, with Stafford McDowall partnering Sione Tuipulotu in the centres.

Steyn joins Jamie Dobie and Kyle Rowe in a potent-looking back three.