Preliminary
Zetsu ( +200 fodder white Zetsu)
One punch GG
Round 1
Konan
Regeneration GG
Round 2
Hidan
Sakura wins
Round 3
Kisame (w/o Samehada)
Sakura wins
Round 4
Orochimaru (Armless)
Restrictions: Eight Branches
Sakura should win, akatsuki Orochimaru was fodder, Tsunade beat armless Orochimaru, he only survived because of Kabuto
Round 5
Sasori
Sakura wins
Round 6
Deidara
Restrictions: C4 / C3
Iffy, regeneration would work?
Round 7
Kakuzu
Sakura wins.
Round 8
Itachi
Restrictions: Spiritual Weapons (Yata / Totsuka)
She can beat him without the weapons, the genjutsu would be tough but regeneration counters,
Round 9
Deva Pein
Restrictions: Chibaku, Large-scale S/T (Konoha wiper)
Sakura wins,
Semi-Final Round
Nagato (Nagato is crippled)
Restrictions: Chibaku, Large-scale S/T, Summoning: Multiplying Dog, Gedo Statue
Sakura can still win,
Final Round
Obito
Restrictions: Gedo Statue
Tie
Obito flees, Sakura still has chakra.
She can beat anyone with intel though. She is smart and crafty