Since Nintendo is stupid and locked out the online multiplayer for Mario Tennis by region, this thread is where the North American branch of Nintendo Life readers can congregate to organize matches.
I'll try to compile a thread-wide Friend Code list in this post, and to kick things off I throw my own digits into the ring.
Panda: 3823-8516-4598
Since nobody receives alerts when someone has added you as a friend, please post when you do so that the other person knows to add you as well.
I hope to see you online!