Roger service ace will able to give him some advantage i suppose... Nadal service is just not fatal enough.

Agree... experience and mentality are very important especially playing in semi and final.
Federer has both but may lose out on stamina to those younger players.
However, he still got his superb ace serve and crazy backhand... his humble attitude too earn him a lot of respects.

Gongrats to R.Federer on winning his 14 slam titles and hope more to come