|United States Grand Prix|
|Venue: Circuit of the Americas, Austin, Texas Dates: 23-25 October|
|Coverage: Live text and radio commentary of all three days, plus BBC TV highlights of qualifying and the race. Full details here.|
United States Grand Prix qualifying has been postponed after a series of delays because of dangerous wet conditions.
Race officials scheduled qualifying for 09:00 local time on Sunday (14:00 GMT), with the race due to start at 19:00.
Austin is being affected by heavy rain on the periphery of tropical storm Patricia, which hit Mexico on Friday.
Mercedes' Lewis Hamilton was fastest in final practice earlier on Saturday but the cars were unable to run in the afternoon because of persistent rain.
After five delays of 30 minutes, race officials accepted at 16:00 local time that there would not be a sufficient break in the weather to allow the cars to run.
Highlights of qualifying will now be aired on BBC Two at 17:00 GMT. Race highlights will be on BBC One at 22:30 BST.
Weather forecasts also predict rain on Sunday, but with much less certainty than on Saturday and of much lower intensity.
Hamilton needs to beat team-mate Rosberg by two points and Ferrari's Sebastian Vettel by nine to seal his third title this weekend.
Vettel and Ferrari team-mate Kimi Raikkonen will be demoted 10 places on the grid from their qualifying positions because of penalties for using more than the permitted number of engines this season.
Hamilton would become only the second Briton to win three Formula 1 World Championships, matching the achievements of Sir Jackie Stewart 42 years ago.
|Title permutations: Can Hamilton win in Austin?|
|If Hamilton wins, Vettel must finish second to prevent Hamilton winning the title at the US GP|
|If Hamilton finishes second, Vettel must finish fifth or Nico Rosberg must win the race to prevent Hamilton winning the title|
|If Hamilton finishes third, Vettel must finish sixth or Rosberg must finish second|
|If Hamilton finishes fourth, Vettel must finish eighth or Rosberg must finish third|
|If Hamilton finishes fifth, Vettel must finish ninth or Rosberg must finish fourth|
|If Hamilton finishes sixth, the title battle will continue to the next race in Mexico, even if Vettel does not finish or collects no points. Rosberg would need to come fifth to still be in contention.|
A modern classic
Any country considering a model for a new Formula 1 race could do far, far worse than look at what Austin, Texas, has achieved with the US Grand Prix.
For a start, there's the track. In marked contrast to many of the so-called Tilke-dromes that have proliferated in recent years, the Circuit of the Americas has real character.
Elevation change, a good selection of challenging corners of differing speeds, the real possibility of creating proper racing and decent viewing.
Beyond that, Austin itself is a superlative host city - vibrant, cosmopolitan, friendly and blessed with great nightlife.
In just three short years, the race has already become a modern classic.
It really is the standard to which all new races must aspire - but from which, sadly, so many fall short.