Predictions on the upcoming chapter 839 of "One Piece" include the assumption that Luffy will finally defeat Cracker in their battle and will be able to proceed to Sanji's wedding and save him. This incident may also leady to Luffy facing Big Mom once and for all.

 During the last chapter 838 of "One Piece," it can be recalled that Luffy gave out his hardest in the battle with Cracker in order to get to Sanji's wedding. During the battle between the two, it looked like Cracker was no match as he kept on being defeated for every punch that Luffy makes on him.

Luffy Holds Upper Hand In Winning Battle Against Cracker

Cracker's true identity was also revealed during battle, which has showed his weakness as not many have ever seen him behind his biscuit disguise. This then gives Luffy the upper hand in the battle and gives him a greater chance of defeating Cracker.

The upcoming chapter 839 of "One Piece" will feature the continuation of the battle between Luffy and Cracker, with the latter having to try harder without his disguise.

The fans of the manga series have assumed that in the upcoming chapter, Luffy will be able to defeat Cracker especially since the latter has admitted to not being used to feeling pain. As long as Luffy continues throwing his punches, his opponent will continue to weaken and giving him a chance to win.

Luffy May Have To Face Big Mom After Being Able To Defeat The Latter's Son In Battle

If Cracker is then defeated by Luffy, this will lead to the former's mother, Big Mom, to a big surprise and will have to face Luffy herself. Luffy will then get to Sanji's wedding, thus begins the battle between Big Mom and Luffy.

These are merely predictions that have been made by the fans of the manga series, and could not know for sure the fate of Luffy until chapter 839 of "One Piece" finally comes out.