It's almost the perfect start for the home side, who have numbers out wide, but Glasgow full-back Josh McKay makes a crucial interception to prevent the try.
He has no support though, and Quins force a penalty which Marcus Smith kicks to the corner.
How it standspublished at 19:58 Greenwich Mean Time 18 January
19:58 GMT 18 January
Harlequins v Glasgow Warriors (20:00)
The hosts are third in the table, level on points with fourth-placed Stormers and Sale Sharks in fifth, while Racing 92 are a point behind in sixth.
However, Quins' points difference advantage over Sale means a bonus-point win over Glasgow would almost certainly seal a place in the knockout stages.
Glasgow are already guaranteed a home tie in the last 16, but could yet top the group if they better Toulon’s result against Sale - that match is on Sunday.
Dempsey returns as injury questions hang over Tuipulotupublished at 19:54 Greenwich Mean Time 18 January
19:54 GMT 18 January
Glasgow Warriors head coach Franco Smith has made five changes from the win over Racing 92 last time out.
Euan Ferrie replaces Gregor Brown in the second row, while Jack Dempsey makes his first club appearance since October, preferred to Jack Mann at number eight.
In the backs, Jamie Dobie comes in for George Horne at scrum-half, and there are starts for Stafford McDowall and Kyle Rowe in place of Sione Tuipulotu and Kyle Steyn.
Tuipulotu was always going to be rested for this game, we’re told, but Scotland’s captain is an injury doubt for the Six Nations having sustained an upper body injury in training this week.
A quick recappublished at 19:43 Greenwich Mean Time 18 January
19:43 GMT 18 January
It's been an all-action afternoon in Europe's premium rugby competition, so let's just take a breath and remind ourselves what's happened to this point.
In Pool 2, Bristol Bears suffered an agonising 33-26 defeat by Clermont Auvergne and are out of European competition.
Thomas Ceyte's try in the sixth minute of overtime denied Bristol a draw and consigns them to bottom spot, meaning they will not make the Challenge Cup.
There was also an impressive 32-25 win for Italian side Benetton against La Rochelle, while Leinster proved too strong for Bath in Dublin, earning a 47-21 win.
Bath held a 21-19 lead at half-time, but Beno Obano's red card swung the momentum towards the hosts, who ruthlessly took advantage.
At Franklin's Gardens, Tom Seabrook's wonderful hat-trick helped Northampton Saints edge out Munster 34-32 in a thrilling contest.
Northampton finish top of Pool 3 and are guaranteed a home tie in the last 16 and the quarter-finals, should they get there.
In Pool 3's other game, Bulls swept Stade Francais aside 48-7 in Pretoria.
Will Mitchell be fit for Six Nations?published at 19:39 Greenwich Mean Time 18 January
19:39 GMT 18 January
FT: Northampton 34-32 Munster
Watching Alex Mitchell receive some attention during Northampton's win over Munster earlier will have been a concern for England fans.
The scrum-half suffered a bang on the knee but was strapped up and remained on the field.
Speaking to BBC Radio 5 Sports Extra, Northampton director of rugby Phil Dowson said: "Alex got a knee to knee [collision] which is painful without, hopefully, being any structural damage."