Yes, trt, it's played every year. I think it feels wrong to go out and defend the title just a few months after winning the Cup, but there it is.
Here's the draw for this year.
http://www.daviscup.com/en/draws-results/world-group.aspx
Yeah, Davis Cup is every year -- there's a case for making it every two years, particularly as a lot of the top players tend to avoid it anyway at least as a regular competition.
Anyway, Murray brothers doing well, so we should be 2-1 up shortly.