Replying to Advice Needed - Tennis

Now that Spring has technically "arrived", so have Spring sports including tennis. I've been playing tennis for around 6 years now and today was the first day of a four day tryout process. I am not sure if it was the weather (30 degrees and wind) or something else, but I played the worse I have in as long as I can remember. I haven't played outdoors in a very long time so this might have been a factor in it, but I really need help with this. I only have a few more days to show these coaches I'm not an awful tennis player, and I'm honestly not sure how to approach this. Any advice regarding playing outside and under pressure? Anything is appreciated.