is it harder to be a rocket scientist or a retail clerk?? just look at the number of people serving and volleying, vs. number of people grinding from the baseline. serving and volleying is inifintely harder because it requires so much risk. it's not technically more difficult because hitting winners from the baseline requires just as much skill. but, it requires a unique type of player, someone who wants to dictate play. you gotta have a fantastic serve, especially second serve (for those 4-4, 30-30 points), and a smashing good first volley. and, you gotta hit a serve and volley within about 1 second.