The final official event on the ATP Calendar for 2013 has just commenced.
Only the Top 8 are invited to attend (Andy Murray is out injured).
There is a lot on the line, not least the Year Ending Number 1 - which Nadal should secure with 1 or 2 victories (depending on which source you read) in the round robin stage, and the prestige of the event itself.
Fast indoor hard courts are not his best surface though.
Federer has won this event 6 times, so is always dangerous and cannot be discounted despite his decline this year.
Both Delpo and Ferrer can also perform under such conditions, as can Berdych.
Wawrinka has had his best career season, and makes his debut, after reaching a career high ranking this year.
The stylish Richard Gasquet returns for the 1st time in 6 years.
Djokovic comes into this on the back of a 17 match winning streak since after the USO, and is clear favourite.
But, since it is a RR, anyone can win it.
See:
http://www.barclaysatpworldtourfinals.com/