I am a new player. I have only been playing about 5 months. I am on a team tennis team in a league of 2.5 ladies. My first singles match was last night. Although I hit nice groundstrokes from the baseline with lots of pace during practice, last night I found myself just constantly 'dinking' it over the net?? It was like everything that I do in practice just went out the window. I am not sure why I did this or what I can do to prepare myself better so that it will not happen again. Also, the match ended up going two and half hours for 3 sets with the 2nd into a tie break. By the third set I was totally out of gas. I drank only water during the breaks and am thinking that I may need to change what I drink (and possibly eat) during the match to avoid this. Any suggestions? Thank you for everyone's help.