Rafa improoved his serve over the years, but still his serve is i think not a weapon like many other top players have their serves as weapon. He had some great matches or tournaments- US open 2010 where his serve was great, or he can use his lefty-wide serve, but overall when you look on his serve and statistics it doesn´t look so good. When we look on aces, only Ferrer is hitting less aces average per match than Rafa - and we all know what height Ferrer has - so it is logical that his serve isn´t big weapon. But funny is that Ferrer is above Rafa in category - points won on 1st serve - 73% Ferrer, Rafa 72%. This is funny, because we can assume that Rafa has 2nd best groundgame after Nole so it is interresting that Ferrer won more 1st serve points % than Rafa. Only Monfils is currently worse in this category - also has 72% points won on 1st serve, but RAfa is above him in statistics. So Rafa is 9th from 10 guys from top 10 in points won on 1st serve- we can assume that Monfils had pretty bad season so far, only last few HC tournaments were good, - but i think Monfils 1st serve is much better than RAfa´s and he most likely will be ahead of Rafa too in this category. So in aces and points won on 1st serve Rafa is one of worst if not worst from top 10 players. Rafa is good on points won on 2nd serve - what is logical, because after 2nd serve there are more often rallies so it is pretty clear that Rafa would be doing great in this. He is 1st in this category. In category SERVICE GAMES WON - Rafa is 15th overall and 7th from top 10 - this is again thanks to rallies after serves-and RAfa´s great 2nd serve statistics. But overall i think his serve is 2nd worst after Ferrer´s in top 10 and this is bad for his game. For example Federer or Djokovic have better serves and it is not so logical like in Berdych, Soderling case- big hitters with powerfull serves, but Federer- has the same toss, great motion and is skillfull and talented and has great serve variety, Djokovic thanks to his confidence has much better serve than he had last season and now better than Rafa´s. Even small Almagro has great quick motion which gives him many free points on 1st serve.