#6 AJ Styles vs. Kurt Angle

After being aligned with Christian Cage for the majority of 2007 and the beginning of 2008, AJ Styles turned on Cage and joined forces with Kurt Angle.
AJ would develop a crush on Kurt's then-wife Karen, and accidentally married her on Impact in February 2008, immediately creating tension between him and Kurt. With Kurt constantly accusing Styles and Karen of an affair and both denying anything beyond friendship, Styles quit Kurt's Angle Alliance faction.
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Kurt and AJ would have some excellent matches, trading victories on Impact, which included AJ winning Kurt's Olympic Gold Medal before AJ defeated him at Slammiversary, and in a memorable and excellent Last Man Standing at Hard Justice. AJ won their feud-ending ladder match on Impact in August 2008.
The two feuded again during the Main Event Mafia vs. TNA Frontline feud, although it wouldn't feature many matches between them. They would also feud in 2010, when AJ would turn heel on Kurt at Genesis, joining up with Ric Flair. The feud didn't continue after that, however.