Scotland's clash with their final Pool A opponent, Japan, is arguably the most pivotal of their tricky group schedule.
Here's everything you need to know about the unmissable fixture.
When is Scotland v Japan?
Scotland face Japan on Sunday, October 13, just four days after Townsend's side's match-up with Russia.
The game kicks off at 11.45am BST.
Where can I watch or listen to it?
Those backing blue can either watch the game on STV or listen to the game on BBC Radio 5 live and 5 Live Sports Extra.
There will also be live text commentary on selected games on the BBC Sport app.
Where in Japan is the fixture and can I still get tickets for the match?
The Cherry Blossoms will be backed by a raucous home crowd at the Yokohama International Stadium.
Fans plotting a last minute trip to the Land of the Rising Sun can check availability of tickets at tickets.rugbyworldcup.com
Stuart McInally (Captain)
On standby: Magnus Bradbury
Michael Leitch (Captain)
Wimpie van der Walt