Oh yeah you will get to choose your doubles partner that you're stuck with for the whole season. Will have to talk to El Nino tonight it seems he has few more ideas for sim as to last night.
Ok back on the team issue what will happen is you'll play for yourslef/ play doubles in just normal tournaments but then there will be odd ones out that you play for your team. (pro grade and amateur grade) 4 players each for each grade. Whilist in these tournaments getting ranking points for your singles ranking you get ranking points on your team rankings as well these team tournaments won't see many tournaments but there will be a few. Then we will have the 1 off Davis Cup tournament that you get picked for your country. Basically most of the time you will be entering tournaments at your own will then maybe 5-7ish will be team games