Playing in the USTA, it seems like everyone attempts a much more timid or safer second serve but there seems to be a suggestion our there that two firsts is better than a weaker or safer 2nd.
What do you recommend? Would if differ if you're playing on the singles line or doubles line? Combo team - should the higher rated person do a double first?
Here's a link to some stats and argument - http://www.nytimes.com/2010/08/30/sp...oc.semityn.www