Tyrannosaurus rex Vs. Spinosaurus Vs. Giganotosaurus Vs. Carcharodontosaurus

The four largest theropods go head to head!  To make it fair, there's only one of each dinosaur even though some hunt in packs. 

Tyrannosaurus rex

Size: 40 ft

Strengths: jaws, size, strength, speed, binocular vision, smartest fighter 

Weakness: not very smart

Spinosaurus 

Length: 50 ft

Strengths: biggest fighter, semiaquatic, claws

Weaknesses: slow, sail, bad eyesight, mostly quadruped, not very smart

Giganotosaurus

Length: 42 ft

Strengths: size, speed, strength, jaws, claws

Weaknesses: not very smart, bad eyesight

Carcharodontosaurus 

(Literally identical to Giga)

Arena: Morocco, 95 MYA

Fight!

The Spinosaurus was starving because of a drought. He left his current territory, looking for a meal. 

A Carcharodontosaurus stalked the herd of Ouranosaurus in the forest. He charged, causing the group to flee. He found a juvenile with an injured leg and pursued, biting her neck. The Carcharo wrestled him to the ground, then decapitated it. 

The Spino picked up the scent of the kill. He followed it, finding the Carcharo eating a dead Ourano. It was a mess. Blood was all over the place and he had no head. The Spino revealed himself, standing on only his hind legs. The two growled at each other, but a loud roar filled the air.

A large male Tyrannosaurus rex appeared, starving and not in the mood for a fight. However, he was desperate and would fight for a meal. The Carcharo began dragging his kill away, but suddenly he was attacked by a Giganotosaurus, who bit his neck. He let go and shook the Giga off, the four growling at each other. The Spino slashed at the Carcharo, but had his sail bitten by the Giga. Then the rex charged, smashing the Giga's ribs. He had saved the Spino.

They teamed up, snarling at the other two. They attacked the Giga, the rex biting him while his allie slashed at his foe. The Giga shook them off and disappeared into the woods. The rex and the Spino faced the Carcharo, but the Giga returned, biting his throat and slamming him down. He stomped on the other carnosaur's skull and shattered it.

The rex and the Spino flanked the Giga, who rammed the rex. He toppled over, the Giga approaching. The two fought, biting each other, the duel going back and forth. Eventually, the Giga bashed the rex's head into a tree and bit his back. The rex screamed before being thrown down. Too weakened to get up, the Giga walked toward him, but the Spino bit his throat. He too was bitten thrown down, but the rex came again. He would die, but the rex would be able to feed himself. But the Giga broke free, smashing the rex into a rock, breaking his ribs. The Spino roared, standing up. The Giga swiftly bit his leg, making the Spino scream. The rex looked up, his vision blurry. However, he could see the Giga biting his teammate's leg. He stood up, catching the Giga by surprise. His jaws clamped down on the Allosaur's throat, making him let go of the Spino. The rex reared around, smashing him into a rock. The Spino watched the tyrant lizard king rip the Giga's arm off. The rex stepped over him and bit the Giga's lower jaw, moving his head down. The jaw was bent farther than normal and snapped. But that wasn't the end. The rex jerked his head back, ripping the jaw off. He roared triumphantly as he stood over the Giga's corpse. He walked over to the Spinosaurus, growling lowly. The two were now a hunting pair. They ate the three corpses then left as the sun set. 

Winner: T. rex and Spinosaurus 

The next fight will be Ceratosaurus Vs. Stegosaurus!