A massive 25 ft Reticulated Python attacks a young tiger, the tiger escapes and then returns to lay down the smack…quite intense!
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For more info, see:

http://blog.modernmechanix.com/2006/07/06/how-frank-buck-filmed-his-tiger-python-battle/

(from the link above)
“An examination of the python’s body showed that the tiger had sunk its teeth deeply and decisively into four places on its back. These wounds were responsible for its weakening and the eventual escape of the tiger.”

Among the largest prey items that are actually fully documented to have been taken were a half-starved old female Sun Bear of 23 kilograms that was eaten by a 695 cm 23 ft specimen, which took some 10 weeks to digest, as well as pigs of more than 60 kg 132 lb.