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Brock Lesnar made his return to WWE at the end of SummerSlam, where he attacked John Cena and beat him down. The Champ defended the Undisputed WWE Championship against Cody Rhodes and dropped the title. As he was about to leave the arena, Lesnar made a shocking entrance and attacked him.
Lesnar has been out of action since SummerSlam 2023 as he was dealing with legal issues. Ultimately, he made his return at SummerSlam 2025 to start a feud with John Cena. But after attacking Cena, he remained absent for a month before returning again in an episode of SmackDown, which was supposed to be Cena's final SmackDown appearance.

Will Seth Rollins be the next opponent of Brock Lesnar?
Brock Lesnar and John Cena had a huge match at the latest WWE premium live event, Wrestlepalooza. Lesnar completely squashed Cena. Presently, it does not look like they will continue their rivalry. In a recent episode of his “Story Time with Dutch Mantell” podcast, Dutch Mantell said that he believed Seth Rollins could be the next opponent of Lesnar. Here is what he had to say;
Brock Lesnar squashed John Cena at SummerSlam event
“I think Seth [Rollins] and Brock [Lesnar]. That would do well. I don’t know how well it would do over a period of time. And even though he’s a heel, I think he’d be a babyface in that one.”
“I’d be interested in seeing GUNTHER and Lesnar. How’s that sound? It sounds good right off the bat. Well, I think that might work. I don’t think Brock and CM Punk—I don’t feel that like I do the other two.”

Seth Rollins is presently having a rivalry with CM Punk
John Cena only has a number of appearances remaining in his present WWE contract, as he is going to retire at the end of this year. Present reports suggest that he will wrestle his final match in WWE on December 13 at the Saturday Night's Main Event show. But it does not look like he will continue his rivalry with Brock Lesnar anymore.