Friendly Enemy/Professional Wrestling

Whenever a rivalry occurs in-show between guys who are actually close friends in real life but have just been walking different character paths, unless the storyline is about betrayal, it will often look like this.
- For example, Matt Hardy's feud on WWE Smack Down with Gregory Helms in 2006.
Hardy has also played this trope in a different way, through the first half of his feud with Montel Vontavious Porter in 2007-2008. After a Badass Boast by MVP ended up getting the two a tag team championship title match, which they won, their entire tag team reign consisted of sports mini-games and trying to one-up each other in matches. It was very much like this trope, until Hardy's appendix issues gave WWE the need to write him out for an emergency appendectomy. This translated into John Morrison and The Miz beating Matt and a disloyal MVP for the tag titles, MVP invoking a rematch clause immediately allowing them to beat Matt again, and, afterwards, MVP finally fully turning on Matt by beating him up (all this targeting a knee injury Matt was selling) and claiming that he will always be better than him.