Jos Buttler makes 42 but Lancashire lose to Worcestershire by 29 runs
Leicestershire Foxes beat Northamptonshire Steelbacks by one run
Jason Roy hits 58 as South Group leaders Surrey beat Kent Spitfires by four wickets
Somerset reach quarter-finals with victory over Middlesex
Notts Outlaws defeat Durham by four wickets, Ben Duckett 53 not out
Birmingham Bears into last eight following 31-run win over Yorkshire Vikings
Hampshire Hawks and Essex Eagles qualify from South Group following wins
Leics 9-0 v Northants
The loser of this is gone.
Leicestershire also have to win their final game on Sunday to have a chance of the top four.
Foxes won the toss and Nick Welch has struck Josh Cobb for six in the opening over.
Yorks v Bears (18:30 BST)
Some rain around in Leeds so the umpires are inspecting.
This is fourth v top in the North Group.
Yorkshire can seal a quarter-final with a win.
The Bears can effectively secure a home tie in the knockouts if they win.
Their net run-rate is well clear of Derbyshire who only have one game remaining - home to Durham on Sunday.
Worcestershire Rapids have lost their fourth wicket at New Road, with Colin Munro caught at long-on by Tim David off Matt Parkinson for 26.
Kashif Ali has just hit Luke Wells for six and they are 135-4 in the 16th over against Lancashire Lightning.
Worcs 118-3 v Lancashire
Moeen Ali brought up the 100 for Worcestershire by lifting Luke Wood over square leg for a huge six - but now he is gone, carving Luke Wells to Wood at long-off.
Moeen made 31 off 17 balls with two sixes and three fours and has now been replaced by Kashif Ali.
Colin Munro is 25 not out at the other end.
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In case you missed the news earlier today.....
England call up uncapped Lancashire seamer Richard Gleeson for their Twenty20 international series against India.
Read MoreMiddlesex v Somerset (starts at 18:15)
The next game to get underway is at Lord's, where Somerset skipper Tom Abell has won the toss and elected to bowl first.
Craig Overton has been released by England to play in this round of Blast fixtures, and he will take the new ball.
A win for the visitors will guarantee their spot in the quarter-finals.
A good over by Luke Wells costs Lancashire just six runs at New Road. Worcestershire are 91-2 after 11 with Colin Munro 21 not out and Moeen Ali on nine. They really need to step on the gas pedal now.
Moeen Ali clearly doesn't intend to hang about as he deposits Matt Parkinson into the crowd at long-on for the first six of the game against Lancashire Lightning. Worcestershire are 78-2 after nine overs - Moeen is eight not out and Colin Munro has 11.
Leg-spinner Luke Wells bowls his first over for Lancashire and Brett D'Oliveira flat-bats his final delivery to Tim David at long-on and departs for 33 from 25 balls.
Worcestershire Rapids are 67-2 after eight overs with Moeen Ali new to the crease. Remember, they have won only one of their group fixtures so far.
Worcestershire have lost their first wicket at New Road with Jake Libby caught at mid-wicket by Luke Wells from the bowling of Luke Wood for 18.
Brett D'Oliveira is 25 not out and they are 49-1 in the sixth over against Lancashire.
Image source, Rex FeaturesLeading run scorers
Top wicket-takers
Jake Libby has hit back to back fours off Luke Wood and Worcestershire Rapids are 28-0 after three overs, having been put in by Lancashire Lightning at New Road. Libby and Brett D'Oliviera are both 12 not out.
Image source, RexSo what do we know?
Surrey are the only team mathematically certain of a place in the last eight.
Five teams - Durham, Worcestershire Rapids, Sussex Sharks, Middlesex and 2021 winners Kent Spitfires - are already out of the running.
If Hampshire Hawks beat Gloucestershire this evening, they will join Surrey in the quarter-finals, as will Somerset and Essex Eagles.
In North Group, whoever loses between Leicestershire Foxes and Northants Steelbacks will not be able to progress. Notts Outlaws must beat Durham to maintain their slim chances, but they will be eliminated anyway if Yorkshire Vikings beat Birmingham Bears - which would put Yorkshire into the last eight.
So Jos Buttler plays for Lancashire this evening but it looks very doubtful that he, Phil Salt, Liam Livingstone, Matt Parkinson and Richard Gleeson play any part, should the Lightning reach the quarter-finals.
The quarter-finals take place on 6, 8 and 9 July - but they are all in England's white-ball squad for games against South Africa, which include T20 internationals on 7, 9 and 10.
We have ball-by-ball coverage of all eight T20 Blast games for you this evening, courtesy of our BBC local radio teams. Choose your stream by clicking one of the audio promos at the top of the page.
We will provide you with occasional updates on events elsewhere via this text commentary, with over-by-over coverage on Hampshire v Gloucestershire - the key game in South Group - which starts at 19:00.
Worcestershire v Lancashire (starts 17:30)
Image source, Rex FeaturesFirst up this evening it's the Rapids against the Lightning at New Road.
Victory for Lancashire will make sure of their place in the quarter-finals - and the exciting news is that they have new England white-ball captainJos Buttler in their side for the first time this season.
They have won the toss and chosen to field first against a Worcestershire side that have won only one game out of 12 so far.
Not too bad - although one or two of our matches could be affected by a passing shower. Carol Kirkwood has a video snapshot on the weather for you below.
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North Group
Worcester: Worcestershire Rapids v Lancashire Lightning (17:30 start)
Leicester: Leicestershire Foxes v Northamptonshire Steelbacks (18:30)
Trent Bridge: Notts Outlaws v Durham (18:30)
Headingley: Yorkshire Vikings v Birmingham Bears (18:30)
South Group
Lords: Middlesex v Somerset (18:30)
Kia Oval: Surrey v Kent Spitfires (18:30)
Ageas Bowl: Hampshire Hawks v Gloucestershire (19:00)
Hove: Sussex Sharks v Essex Eagles (19:00)
Image source, RexJust three days left of group games in this year's T20 Blast.
The race to be involved in the quarter-finals - which will take place from 6-9 July - is hotting up with Surrey already through, and 12 other teams still theoretically in contention across the two groups.
Welcome to our coverage of eight games. Worcestershire v Lancashire starts at 17:30, with more to come at 18:30 and 19:00.