Another reason why male Lion would win its mane protects it from neck bites, and Tigers instinctively as hunters bite the neck...the equaliser imo is that a big siberian is 650 pounds, and a big lion is 450, and the tiger is more agile. Alot of this agility is nullified by the fact animals have no fighting training obviously and they can maximize their advantages, but a I know for a fact caspian tigers were good fighters that could easily kill a lion.