Say you drive stock Honda Civic in a car race. As you win more races, you will face tougher racers.
Whether I pit you against some Toyota Prius in the beginning or against some hypercars like a Veyron / Zonda, at the end of the championship race, you will rank right where you belong, probably in the middle.
This is how GAC works. The more you win, the higher you'll rank, the tougher the opponents are at the top. Even if you're facing against "equal" opponents at the beginning, you will eventually meet strong teams at the end and you will start losing, just in a reverse streak.
Unless your terms of "equally matched" means you having the advantage over your opponent, which most players do believe is "fair", then you can forget about everything I mentioned above.