A friend taking lessons from a pro was given this advice. How sound is it? Lets say his first serve percentage is approximately 70% and his second serve is shaky, so lets say its about 65%. In a match, he was told that he should use his first serve as his second serve and just keep practicing his second serve during practice only until it becomes more reliable. I argued no. As long as its not the finals of some god important tournament you've entered, yes, your second serve may be weak and not even as reliable as your first serve but a match is a good place as any to practice the second serve. Especially, if the difference between 1st and 2nd is negligible. He argued that I should play the higher percentage shot. If thats the case, one might as well dink in the second serve. Lets assume this is for a 3.5 rated player so that I dont hear any comments like one should have a higher second serve percentage for a player thats rated any higher than a 3.5. Also, I know this isnt practical in real play but please dont take into consideration about what your opp. feels more comforatable returing.