Okay, we have some very interesting choices so far. Let's see:
Definitive nominations:
-Left Pong Paddle vs. Right Pong Paddle
-Link vs. Navi
-L-Block vs. (Line Piece, Square Piece or Z-Block)
Other Interesting choices that caught my eye:
1._Einstein vs. Hitler
2._Hunter vs. Duck
3._Monkeyball vs. Gravity
Charles Barkley vs. Michael Jordan doesn't look very appealing to me, honestly.
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Nominate Left Pong Paddle vs. Right Pong Paddle for the Rivalry Contest!