Who are your favorite doubles players to watch? I hear Mark Bryan is ranked well.
i like watching rajeev ram and joe salisbury
It is nice to know that in addition to tennis partners they are also good friends. I would assume that sometimes teams are formed where this is not the case.
yeah that is cool. do you know who is playing in the olympics for us tennis?
I think Serena and Venus Williams have a chance at qualifying.
have they won any medals before?
Serena has 4 gold medals from three different years.
that's very impressive. they must have started playing when they were real young right?
Yes, I believe they started playing at age 4.  
wow i couldn't imagine even holding a racket at that age
They make smaller equipment for very young children.