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It has already been announced that John Cena will wrestle his final match at the upcoming Saturday Night's Main Event show, which will take place on December 13. Cena presently has four appearances left in his contract, one of which will be at the upcoming Crown Jewel event in Perth, where he will face AJ Styles.
It has not been officially confirmed who John Cena will face at his retirement match, and it has been a matter of speculation. A lot of names have been pitched by the fans to pundits, who believe that the opportunity should be given to a younger talent like Bron Breakker or Dominik Mysterio.

Triple H talks about the upcoming final match of John Cena
Some fans believe that it should be someone who has a past record with the 17 times World Champion, like Edge or Brock Lesnar. He already had a match with Brock Lesnar recently where he had been decimated, and Edge is presently under contract with AEW, so neither of these matches is looking to be happening.
John Cena's final opponent has not been officially revealed yet
The present WWE Chief Content Officer, Triple H, recently talked about the upcoming retirement match of John Cena that will take place on December 13 at the Saturday Night's Main Event show. He showed real optimism about this match while speaking on social media. Here is what he had to say;

Gunther is rumored to be the final opponent of Cena
“John’s contributions to WWE are immeasurable. There are no words that can truly relay how much he means to this business. Together with our partners at Events DC and Capital One Arena, we look forward to honoring his legacy and delivering an unforgettable send-off for both John and the WWE Universe.”
According to the latest reports from Dave Meltzer of the Wrestling Observer Newsletter, Gunther is going to be the final opponent of John Cena's professional wrestling career. Gunther is presently out of action after he suffered multiple injuries at SummerSlam, where he dropped the World Heavyweight Championship to CM Punk. Gunther can also be an exciting opponent to end the career of Cena.