There's a flurry of early scores in Munster where Jason Tovey gave the Dragons an early lead with a penalty before Andrew Smith crossed for the home team with Keatley converting.

But the Dragons hit back instantly with Ashton Hewitt crossing for a try which Tovey converts.

I spoke too soon as Ospreys respond at the next scrum, splintering the Connacht eight.

Some early danger signs for Ospreys at the first scrum, as Connacht put the pressure on to earn a free-kick. Predictably they opt for another scrum.

Ospreys kick off and Connacht field well, opting to keep the ball in hand and work their way steadily out of their 22.

The Irish are playing into a stiff breeze so it's a sensible tactic for them in this first half.

Moments before kick-off now and the atmosphere is building at the Sportsground.

I'm pretty sure I can hear the Dropkick Murphys pounding out through the tannoys. Quality music!

It's the biggest day of the Pro12 season so far...

Can Ospreys seal that vital home play-off semi-final? Can Scarlets clinch an automatic European Champions Cup place?

And will Cardiff Blues and Newport Gwent Dragons end their seasons on a high?

Join the debate by tweeting with #ScrumV, email us, or get in touch on Facebook., external

Treviso fly-off Luciano Orquera gets the match underway at the Stadio Monigo.

Adrian Hadley
Former Wales wing on BBC Radio Wales

It's going to be vital for the Ospreys to perform today.

They did the hard work against Glasgow last week but Connacht will be tough opponents.

Ospreys have got good consistency in selection - they've kept James King at blind-side flanker who was excellent against Glasgow and deserves his place.

If you click on the 'Live Coverage' tab at the top of this page you will find plenty of choice of television and radio match coverage from our national bases in Cardiff, Belfast and Glasgow.

And we'll still be here in text world bringing you the action and reaction from across this afternoon's Pro12 competition.

Connacht coach Pat Lam

We know the challenge we face against Ospreys, it's a huge challenge.

The last six weeks I've been keeping an eye on them and they've been very impressive.

Every team needs generals and they've got some world-class generals - Rhys Webb, Dan Biggar, Alun Wyn Jones.

Edinburgh need a bonus-point win to stand any chance of breaking into the top six and qualifying for the Champions Cup, but will also need Scarlets and Connacht to slip up.

Like Connacht there is also the possibility of a European play-off for the Scottish team. Leinster can't reach the play-offs and have secured a Champions Cup berth so have nothing to play for, but it is unlikely the 2014 European Champions will just come to the Scottish capital to roll over.

Team news

Edinburgh: Jack Cuthbert; Dougie Fife, Sam Beard, Andries Strauss, Tim Visser; Tom Heathcote, Sam Hidlago-Clyne; Alasdair Dickinson, Ross Ford, John Andress, Anton Bresler, Ben Toolis, Fraser McKenzie, Hamish Watson, Cornell Du Preez.

Replacements: Neil Cochrane, Rory Sutherland, Simon Berghan, Ollie Atkins, James Hilterbrand, Nathan Fowles, Jade Te Rure, Tom Brown.

Leinster: Rob Kearney; Zane Kirchner, Colm O'Shea, Noel Reid, Dave Kearney; Ian Madigan, Isaac Boss; Jack McGrath, Richardt Strauss, Mike Ross, Devin Toner, Mike McCarthy, Jordi Murphy, Sean O'Brien, Jamie Heaslip (capt).

Replacements: Aaron Dundon, Michael Bent, Tadhg Furlong, Tom Denton, Jack Conan, Luke McGrath, Jimmy Gopperth, Cian Kelleher.

Cardiff Blues will finish 10th in the table whatever the result against bottom side Zebre and will be lowest placed of the four Welsh regions.

But if the Italians repeat last season's victory at the Arms Park and Treviso lose, then Zebre will represent their country in next season's Champions Cup.

Team news

Cardiff Blues: Aled Summerhill; Alex Cuthbert, Tom Isaacs, Gavin Evans, Richard Smith; Rhys Patchell, Tavis Knoyle; Gethin Jenkins (capt), Kristian Dacey, Adam Jones, Filo Paulo, Lou Reed, Macauley Cook, Sam Warburton, Josh Navidi.

Replacements: Rhys Williams, Thomas Davies, Taufa'ao Filise, Josh Turnbull, Manoa Vosawai, Lloyd Williams, Garyn Smith, Gareth Anscombe.

Zebre: Dion Berryman; Giulio Toniolatti, Mirco Bergamasco, Gonzalo Garcia, David Odiete; Luciano Orquera, Brendon Leonard; Samuela Vunisa, Andries van Schalkwyk, Mauro Bergamasco, Marco Bortolami (Capt), Quintin Geldenhuys, Dario Chistolini, Oliviero Fabiani, Andrea De Marchi.

Replacements: Tommaso D'Apice, Andrea Lovotti, Luca Redolfini, Valerio Bernabò, Filippo Ferrarini, Guglielmo Palazzani, Tommaso Iannone, Filippo Cristiano.

A victory, draw or even a high-scoring loss with two bonus points would be enough for Scarlets to secure automatic qualification for the Champions Cup.

Depending on how Connacht and Edinburgh fare, even a loss could be enough for Scarlets. Treviso will be going all out for a win themselves to stay ahead of Zebre and claim Italy's entry into the Champions Cup.

Team news

Treviso: Jayden Hayward; Andrea Pratichetti, Luca Morisi, Enrico Bacchin, Simone Ragusi; Sam Christie, Henry Seniloli; Mat Luamanu, Francesco Minto, Paul Derbyshire, Corniel Van Zyl, Antonio Pavanello (capt), Rupert Harden, Davide Giazzon, Matteo Zanusso.

Replacements: Albert Anae, Romulo Acosta, Salesi Manu, Marco Fuser, Meyer Swanepoel, Nicola Cattina, Angelo Esposito, James Ambrosini.

Scarlets: Liam Williams; Adam Warren, Hadleigh Parkes, Scott Williams, Steff Evans; Rhys Priestland, Gareth Davies; Rob Evans, Ken Owens, Peter Edwards, Jake Ball, Lewis Rawlins, Aaron Shingler, James Davies, John Barclay.

Replacements: Ryan Elias, Phil John, Wyn Jones, George Earle, Rory Pitman, Rhodri Williams, Steven Shingler, Daniel Jones.

Munster must win and ideally win with a bonus point to overhaul either Glasgow or Ospreys and keep Ulster at bay.

Dragons will finish ninth whatever the result, but will they be able to do a favour for their Welsh compatriot Ospreys?

Team news

Munster: F Jones; K Earls, A Smith, D Hurley (capt), R O'Mahony; I Keatley, C Murray; J Ryan, E Guinazu, BJ Botha; B Holland, P O'Connell; D Ryan, P Butler, CJ Stander.

Replacements: N Scannell, D Kilcoyne, S Archer, S Dougall, J O'Donoghue, D Williams, JJ Hanrahan, A Conway.

Newport Gwent Dragons: J Tovey; T Prydie, T Morgan, J Dixon, H Amos; D Jones, J Evans; B Stankovich, H Gustafson, B Harris; C Hill, R Landman (capt); N Crosswell, N Cudd, T Faletau.

Replacements: R Buckley, P Price, L Fairbrother, M Screech, J Benjamin, R Rees, A Hewitt, G Rhys Jones.

Arguably this is the tie of the round, with second playing fourth as Ulster attempt to inflict Glasgow's first home defeat in the Pro12 this season.

The loser will definitely face a trip away in the play-off semi-finals, while the winner could still miss out on home comfort depending on the Ospreys and Munster results.

Team news

Glasgow Warriors: S Hogg; T Seymour, R Vernon, P Horne, S Lamont; F Russell, N Matawalu; R Grant, D Hall, R de Klerk; J Gray, Al Kellock (c); J Strauss, C Fusaro, A Ashe

Replacements: P MacArthur, G Reid, M Cusack, L Nakarawa, R Wilson, H Pyrgos, D Weir, P Murchie.

Ulster: L Ludik; R Scholes, S Arnold, S McCloskey, M Allen, I Humphreys, P Marshall; A Warwick, R Herring, R Lutton, L Stevenson, F van der Merwe, C Ross, C Henry (c), R Diack

Replacements: R Best, K McCall, B Ross, I Henderson, R Wilson, R Pienaar, P Jackson, T Bowe.

A win could well be enough to earn leaders Ospreys a home draw in the play-offs, but a bonus-point win would make absolutely sure.

But that could prove tricky against a Connacht side who have proved a really obstinate obstacle at home in Galway and have an outside chance of sixth place if they win and Scarlets lose in Treviso.

Even a loss could see the Irishmen claim a place in the Champions Cup play-off against Gloucester, but that would rely on Leinster beating Edinburgh.

Team news

Connacht: T O'Halloran; F Carr, R Henshaw, B Aki, M Healy; J Carty, K Marmion; D Buckley, T McCartney, R Ah You; A Browne, A Muldowney; J Muldoon (c), E Masterson, E McKeon.

Replacements: D Heffernan, JP Cooney, F Bealham, M Swift, G Naoupu, J Cooney, M Nikora, S O'Leary.

Ospreys: D Evans; H Dirksen, B John, J Matavesi, E Walker; D Biggar, R Webb; N Smith, S Baldwin, D Arhip, T Ardron, A Wyn Jones (captain), J King, J Tipuric, D Baker.

Replacements: S Parry, M Thomas, A Jarvis, R Thornton, D Lydiate, T Habberfield, S Davies, J Spratt.

So, without further ado, let's take a look at those all-important fixtures and the team news.

If two or more teams finish with the same number of league points, their placings will be determined by the following criteria in descending order:

•number of matches won

•the difference between points for and points against

•the number of tries scored

•the most points scored

•the difference between tries for and tries against

•the fewest number of red cards received

•the fewest number of yellow cards received

Simples...

Ospreys fly-half Dan Biggar leads the "most points" list, but trails Leinster counterpart Ian Madigan in the race for the award given for the player with the best kick at goal success rate. Munster's JJ Hanrahan won the Golden Boot in 2013-2014.

Image source, Huw Evans picture agency, Getty Images

Image source, Huw Evans picture agency

It is not just Pro12 league positions to be decided today, there are also other matters to be cleared up such as who be the top try scorer, point scorer and Golden Boot winner?