Seth Rollins looms large at SummerSlam amid possible knee injury

The Undisputed WWE Championship and the World Heavyweight Championship will both be up for grabs during the first-ever two-night SummerSlam this weekend.

Gunther will defend the World Heavyweight Championship against CM Punk, and John Cena, in likely his final SummerSlam premium live event, will defend the Undisputed WWE Championship in a street fight.

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There’s one person who looms large over the entire world championship scene, and he is Seth Rollins.

Rollins appeared to have suffered a knee injury during his Saturday Night’s Main Event match against LA Knight. He came up lame as he tried to land a moonsault onto Knight. The re...