Tournament game on Monday- I need to win

Hi- the 4th and final round of a tournament is this Monday.

I know who my opponent will be.
I have 2.5 points; he has 3.
That means he can still win the tournament if the game results in a draw.
I need to win this game if I want to win the tournament.
I know that I will play 1.d4 with white, but if by chance he gets to play white, what shall I do? I know he normally plays the Ruy Lopez. I'm planning on playing 1...Nc6 if he plays e4 because he completely collapsed when I played it against him in a blitz game 7 months ago. I doubt he remembers that game and researches the opening.
But remember, he doesn't have to play the Ruy Lopez like I expect him to. He can simply play for a draw and he'll still win the tournament. If he's cunning enough, he could play a completely different opening. I'm wondering what you think he might play, and some concepts I should remember during Monday's game to try and win against him.
Some additional information:
He plays the Ruy Lopez with white, 1...e5 or 1...e6 against e4, and Bogo-Indian against d4. He probably leans slightly more towards positional play.

Also, I played this game against him 7 months ago (I was white): lichess.org/329phvfG

Thanks for reading. Happy Chessercising

You will be White, because if 2 people need to play the same color, the higher person switches colors, the lower person stays

Do what I did to get 1st today, go FULL AGGRO, like play the most aggressive opening you can (if you know it)

There are not few severe mistakes in the posted game, I don't think that the opening decides the battle. The one who blunders less wins. So, make sure you'll be in the mood and concentrated.

Yeah, just like if you had a test in school or anything you need, eat a good breakfast, have good sleep etc. Protein is also helpful,I know a physologist who said eating protein right before or in the round stops blunders(I don't know how, but she is a physcologist

In my view you can keep the position in balance. I think your opponent will make mistakes. You like to give activity to your pieces. So play in peace. The Spanish is a good opening in which the strongest usually wins. Pay attention to the Marshall Gambit. If you can avoid it with the push in a4. The Marshall is a good way to equalize.

But the thing is he's playing someone 1750 and he's 1250, and he plays d4

@thekid456 #2 Thanks for that- that's a huge help

@SirDillyMoves I hate to break it to you, but I've never played any aggressive e4 openings :( From my experience both the London System and Queen's Gambit give pleasant positions to white and there may be piece sacrifices- just not furious attacks on each other's kings

@Sarg0n That game was played 7 months ago and at that time I didn't know many variations, so I'm sorry I blundered the pawn in the opening. You do have a great point there. I certainly believe my opponent is just like any other human. But if he intends to play for a draw he might be less inclined to make more daring moves. I am about the same strength as him, but my rating is 500 points lower. So, he might *not* play for a draw if he doesn't want his rating to decrease a bit.

@thekid456 #5 Thanks for the advice; at the moment we don't have any meat, fish, eggs or beans in the fridge, but we have yogurt.

@massimilianoferri I have been researching the Cozio Defense against the Ruy Lopez and from my research it appears to give black a very good, equal (not draw) game. But I am planning to play 1...Nc6 against e4. Last time I played it against him 7 months ago in a blitz game he played 2.d4 quickly, but here if he takes a minute he may come up with 2.Nf3, which pretty much forces me to play 2...e5 (which I'm fine with).

in ur case i would play smthg sharp
2 reasons first hes a posi player
secondly u have to win
so for black sicilian would be good and for white smthg really asharp