BetOnline has published a market for the first match to be confirmed for this year's WWE SummerSlam.
On last night's episode of WWE Monday Night Raw, it was announced that Nikki A.S.H will defend her recently-won WWE Raw Women's Championship in a triple threat match against former titleholder - Charlotte Flair - and Rhea Ripley.
As of the time of writing, the champ is a -115 favourite. A decision for Rhea Ripley will pay out at odds of +150 while a win for Flair is priced +175.
Other matches like Roman Reigns .vs. John Cena, Bobby Lashley .vs. Goldberg and Seth Rollins .vs. Edge are expected to be on the August 21st card. I believe it safe to conclude that, once they are made official in storyline, markets will become available.