Here are the current betting odds for WWE Summerslam 2018 courtesy of BetWrestling.com and 5Dimes:

Mixed Tag Team Match
D. Bryan & Brie Bella -425 (favorite)
The Miz & Maryse +305

WWE Championship
AJ Styles -165 (favorite)
Samoa Joe +125

Hell in a Cell Match – WWE Universal Championship
Roman Reigns -365 (favorite)
Braun Strowman +255

WWE Raw Women’s Championship
Ronda Rousey -900 (favorite)
Alexa Bliss +500

Hell in a Cell Match
Jeff Hardy +260
Randy Orton -380 (favorite)

The favorites have the "-" symbol and the underdogs have the "+" symbol. For the favorites, the number represents the amount of money you would need to risk to win $100. For the underdogs, the number represents the amount of money you would win if you risk $100.