Chang is at 52%, Courrier at 53% (same as Sampras), Agassi is at 54% though.
Chang, Courier and Agassi all had much better ground games than Sampras, which may contribute to these stats.
On the topic, nowadays I sometimes saw Söderling, Berdych or Tsonga going for a very big second serve.
What makes me laugh on that topic is that :
- if he succeeds, people say "great ! such great "balls" !
- if he misses, people say "double fault ! horrible choke !"
The line between genius and moron is always very thin.
Furthermore if you play someone like Nadal, it's better to lose the point on a df than after a long grueling rally.
Well, this depends. If I am playing Nadal and I am up 40-0 or even 40-15, yeah I may attempt to go big on a 2nd serve, especially if I am still tired from the point before.
But if it is 30-30, Deuce, or 40-30 or 30-40, Advantage either way, in that case, I personally would have to hit a regular 2nd serve and take my chances in the rally.
I don't have a serve like Raonic, Roddick, or Tsonga though.