Deletion of 2013–14 United States Open Cup for Arena Soccer

Comment: no credible policy-based rationale to keep. Having multiple Wikipedia pages does not establish notability. Dravecky above notes that the tournament "has been the subject of in-depth coverage by multiple reliable third-party sources", but there is no evidence to support this position. Current sports league seasons mentioned by DallasHammster have articles due to the extensive coverage, which doesn't seem to be the case for this season. Looking through the references I see blogs, Facebook pages and team sites. As TheScottDL mentioned above, even the "official" web page for this tournament seems to be using Wikipedia as a host for its results, in violation of 
Stance: delete
Cited policy: Wikipedia:What Wikipedia is not (WP:NOTWEBHOST)

Comment: over the years" is not up for discussion here, but while you mention it, it looks like none of the other tournament seasons nor the tournament page itself have established any kind of notability. I would also like to address Jnp7675's comment about this page being the "main and definitive source for this specific tournament, combining information directly from the League Commissioner and League Public Relations Director, and from social media like Twitter and Facebook" which looks like a textbook violation of 
Stance: comment
Cited policy: Wikipedia:No original research (WP:OR)

Comment: while the tournament itself is notable and we should keep the parent article, I don't think this article is a notable  of the parent, and that everything that is worth noting about this season should be included in the parent article
Stance: delete
Cited policy: Wikipedia:Content forking (WP:SPINOFF)