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Jessica Eye vs. Sarah Kaufman
This may turn into a rivalry for 2014, but it didn't have enough impact to make the 2013 list. Keep an eye on these two ladies.
After their fight, Sarah Kaufman took to Twitter to complain about the decision. She then began to lobby for a rematch. Jessica Eye didn't take kindly to it, calling Kaufman a sore loser.
As they continue to trade barbs on Twitter, this may be a rivalry to watch in the coming year.
Ben Askren vs. UFC
This may have made the 2013 list, but the UFC largely ignored Askren.
It is a shame that the UFC did not sign such a quality welterweight, especially considering the loss of Georges St-Pierre for the foreseeable future.
Askren is active on Twitter, and he took shots at the MMA leader. Now, he's off to One FC.
Conor McGregor vs. Featherweights
McGregor burst onto the scene with electric performances and has quickly risen up the ranks. Other featherweights have not taken this kindly.
This fails to make the list because outside of some social media barbs, nothing has come from it. No featherweights stand out, and they are trying to get a fight with someone with a significant fanbase. There is nothing wrong with that, but there is no singular rivalry stemming from this just yet.
Jon Jones vs. Alexander Gustafsson
This could turn out to the best in-cage rivalry, but it isn't quite there yet.
Jones and Gustafsson had more of a friendly banter between them on Twitter and were respectful of each other during fight week. And it all started with a staredown pic that was tweeted.
This pairing simply lacks heat. There is nothing wrong with that, and should their second meeting—if it occurs—equal their first, then we are looking at a pairing that could go down in history. This is not a heated rivalry, but worth a mention.