League Tennis Championship tournament advice?

Hi my league for tennis is having the singles and doubles tournaments at the end of this week. I am number one on my team and will be the number two seed in the tournament. I was 9-3 this year, losing to the same kid all three times(Nick). He is the one seed and went undefeated, not losing a set. Of the other one seeds i played i beat one kid pretty bad(Tanner), had 2 battles then a beatdown with another(Caleb), played a number two once and had a battle(Andes), beat a number one twice in 3 sets(Sawyer). The number two player of the undefeated kids team is pretty good too. In my bracket i should have Caleb as the number three seed, the number two from Nick's team, plus Andes, plus either Tanner or his number two, and a wildcard school. First round I will get a bye, we play two rounds per day. I just want advice how to approach this, I won the doubles tourney last year but doubles is different from singles. Just how to pace myself for multiple matches. I love to play a defensive style, I have great court coverage, I have the best serve in the league, and I have average groundies. I am good at the net too. I have had cramping issues in the past in my legs/quads. Just some advice please.