The outcome would depend upon the level of the Phoenix Force. At high end it could win by itself.

Matchup in the order listed
Round 1

Hulk vs Invisible Woman - Sue is powerful, but Hulk has always given the entire FF problems. He powers through Sue's force fields like he's done for 50 years.

Iron Man vs Captain Marvel (Carol)- Good fight, IM has his hands full but lasts to the next round.

Quasar (Wendell)vs Jean Grey as Phoenix - Depend upon the Phoenix Force, could be over in seconds, which would ruin the whole post. So, assuming a lower level Phoenix Force, Quasar still goes down but not as quickly.

Spiderman vs Scarlet Witch - Whoever strike first without mercy wins.

Superman vs She-Hulk - Not even close, Superman destroys her.

Thor vs Storm - Biggest mismatch in comic history. Just like in Contest of Champions 3 - Thor laughs at her attempt to use a storm against the God of Thunder.

Wolverine vs Wonder Woman - Not even close, WW destroys him.


Round 2

Hulk - Ironman - Superman - Thor
vs
Captain Marvel - Phoenix - Wonder Woman

Hulk helps Ironman beat Captain Marvel
Superman holds off Phoenix
Thor beats Wonder Woman

Round 3

Hulk - Ironman - Superman - Thor
vs
Phoenix