D&D PvP: How to balance one powerful vs two weaker players.

I'm wondering what levels you think would work best for pvp in a dungeon or other unique environment (possibly multiple rooms and props) if it's one more powerful player vs a team of two weaker players.

Would a level 5 with an uncommon magic item of choice vs two level 3 players be an even match? I figured without the item level 3s multiple turns and potential synergy would be a more likely win, so I buffed up 5s raw power with an item but felt level 6 with no item would be too powerful because of D&D scaling.

What that work, and what other levels could work for this? I want this to be as even of a match as possible.