I agree with @zenvelo, to the point that I would not try to do competitive sports on a vegan diet. I doubt if my body could take it. However, bodies differ and yours might be particularly well suited.
If you can, you’ll want to eat lots of eggs, as they are easily assimilable little protein-bombs. Brown rice and lentils, plenty of green leafies, the usual.
I’d advise, if you can afford it or can find someone who will do it for lulz, someone who is willing to study up on sports nutrition and help you plan out your meals ‘scientifically’. The information is all readily available. You could do it yourself, but it is a bit complicated.
Hell, it’s an interesting project though- I’d volunteer myself if I didn’t have so much else going on.
Here are some more specific suggestions:
Green salad with walnuts and undressed white tuna
Caprese
Gorp
Fried tofu with onions (available at your local Asian market) served with grated carrots and brown rice
I’m not vegetarian, but I have been on several occasions, and I’ve done a lot of cooking-for-vegetarians. It’s fun!