FT: London Irish 39-29 Harlequins
Ojo, Bell, Treviranus and McKibbin score tries for Irish, Bell kicks 19 points
Marchant, Yarde, Care and Walker reply for Quins; Brown sin-binned late on
FT: Saracens 55-24 Northampton
Maitland (3), Barritt, Wigglesworth, Lozowski, Koch, Brits and Spencer with tries for Sarries
Wood scores twice in reply for Northampton
FT Wasps 50-35 Sale
Robson (4), Wade, Rowlands and Rieder with tries for Wasps
McGuigan, Ben Curry, Solomona, De Klerk and Strauss reply for Sale
Saracens 24-3 Northampton
Image source, Getty ImagesTry number four and a bonus point already for Saracens
It's showpiece rugby perfectly suited to Twickenham.
Some delightful handling - notably a stunning offload from hooker Schalk Brits - close to the line ends with Alex Lozowksi going over.
Lozowski adds the extras again.
Saracens 17-3 Northampton
Saracens show their clinical side, piling on more pressure on Saints as Alex Lozowksi puts a smart kick into the corner.
It's proper one-way stuff at the moment.
Saracens 17-3 Northampton
Sarries have a chance to respond immediately but Alex Lozowski is just short with a long-range kick.
Saracens 17-3 Northampton
Northampton fans have something to cheer at last.
It's only three points from a simple kick, but it's a start.
Saracens 17-0 Northampton
Image source, Getty ImagesMoments after Nic Groom and Nafi Tuitavake threaten a long distance score for Saints, Saracens are in for a third try.
Saints crowd the centre of the pitch leaving big gaps out wide and when ball is spread from left to right, Sean Maitland is left with acres of space to go over in the corner.
This is scintillating stuff from Sarries.
Alex Lozowski misses the conversion though.
Saracens 12-0 Northampton
Saints meanwhile have missed a chance to get on the scoreboard, Harry Mallinder off target with his kick at goal.
After the start they have had they can ill afford to miss kickable chances.
Saracens 12-0 Northampton
Meanwhile, George Kruis is replaced. The Saracens and England star looked to be struggling with an ankle knock and is replaced by Nick Isiekwe.
Mich Eadie also comes off and is replaced by Jamie Gibson.
Saracens 12-0 Northampton
Northampton looks dazed and so does number eight Mitch Eadie who has taken a big whack and needs a bit of treatment.
This might help Saints gather some thoughts. They are really struggling to cope with the angles the Saracens backline are running.
Chris Jones
BBC 5 live rugby union commentator
Image source, Getty ImagesSaracens have scored two in two minutes and are looking irrestistible.
Saracens 12-0 Northampton
The pressure is relentless. Saracens double their lead.
Richard Wigglesworth is the man to stretch his arm and touch down after a fine team move. Saints have no answer at the moment.
Alex Lozowski adds the extras.
Saracens 5-0 Northampton
Image source, Rex FeaturesThere's the first try.
Vincent Koch bundles through near the line and when play is quickly recycled, there's a simple score for Brad Barritt to the left of the posts.
The conversion is missed by Alex Lozowski.
Saracens 0-0 Northampton
A big up and under from Saints scrum-half Nic Groom goes straight out.
Saracens go through their phases, with Vincent Koch prominent.
There's a sniff of a chance too for Alex Goode to break clear but he's unable to take a neat close pass and Saints stand firm. For now.
Saracens 0-0 Northampton
Saints have good field position near the Sarries 22 but the ball goes forward from Tom Collins after a promising move.
Saracens 0-0 Northampton
Some early pressure from Saracens but some loose play in midfield gifts possession to Saints. They in turn are sloppy with the ball. A scrappy start.
Saracens 0-0 Northampton
We are under way at Twickenham.
Saracens v Northampton (14:00 BST)
Image source, Getty ImagesThe teams run out to a wall of noise. It's a glorious setting and a glorious day at Twickenham. Everything is set for a fantastic game.
We are moments from kick off.
As well as following our live text service this afternoon, we also have live radio commentary available on all three Premiership fixtures.
BBC Radio 5 live, as well as BBC local radio, are covering the Twickenham double-header.
And if you're fans of Wasps or Sale then you can listen to BBC Coventry & Warwickshire coverage when that kicks off at 15:00 BST.
Simply select your commentary from the carousel above and press the play button. Easy.
Your tips to shine this season
The first game of a Premiership rugby season is a big day for any player.
But it's probably even a bigger one for teenage flay-half Marcus Smith, who is making his Premiership debut for Harlequins this afternoon when they face London Irish in part two of the Twickenham double-header.
Image source, Getty ImagesTeam-mate and England scrum-half Danny Care reckons Smith "has it all", while former quins winger Ugo Monye expects the 18-year-old to be capped by England in the next year.
No pressure then. So, with all that expectation in mind we want to know who you are tipping for a big 2017-18 season.
Let us know using #bbcrugby on Twitter.
Saracens v Northampton (14:00 BST)
Everyone wants to play at Twickenham. But Saracens seem to enjoy it more than most.
They have featured in every London double-header so know the surroundings well, but they failed to reach last season's showpiece Premiership final.
Northampton Saints underachieved last season, losing 12 league games as they finished seventh and missed out on the play-offs.
A win today against a powerful Sarries side would set Saints off on the right footing.
Saracens v Northampton (14:00 BST)
Image source, Getty ImagesLet's check out the team news from the Sarries-Saints tussle.
Wales lock Dominic Day makes his first start for Saracens, who also include British and Irish Lions duo Maro Itoje and George Kruis.
Mitch Eadie is in for a first competitive start for Northampton.
Saracens: Goode; Maitland, Taylor, Barritt (capt), Earle; Lozowski, Wigglesworth; Barrington, Brits, Koch, Day, Kruis, Itoje, Burger, Wray.
Replacements: Spurling, Thompson-Stringer, Figallo, Isiekwe, Rhodes, Spencer, Bosch, Wyles.
Northampton: Tuala; Foden, Tuitavake, Burrell, Collins; Mallinder, Groom; Waller, Hartley (capt), Brookes, Lawes, Day, Wood, Ludlam, Eadie.
Replacements: Haywood, Ma'afu, Hill, Ribbans, Gibson, Mitchell, Grayson, Pisi.