...And your reasoning is?
Really hard to describe events with words for dogfights. That´s why you always see pilots, no matter where they´re from talking with their hands simulating the planes, but I´ll try.
The Corsair is faster, climbs better and dives better than the Zero.
Now as in a real fight the one person on top of another has an advantage over the other because of gravity. In air combat case...
A good Corsair pilot would, starting equal altitude, use his superior speed and climb rate to first climb to gain an altitude advantage over the Zero pilot. Then he would close to attack.
His extra altitude over the Zero would give him more energy to spend when he closes to start the actual dogfight.
He gets a good altitude advantage over the Zero, dives down to attack on the Zero, preferably from an angle making the Zero use up as much of his energy early as possible. The Zero must turn up, to meet the attack head on, or perform a defensive move to avoid the attack.
If the Zero pilot turns up into the diving Corsair, the Corsair has the huge advantage of plane durability. Even if both the Zero and Corsair hit each other with guns, the Zero will probably be a flaming wreck and the Corsair still flying.
If they miss each other with guns, after his dive the Corsair pilot keeps his speed up and goes into a climbing turn to repeat the same attack down onto the Zero.
¨Boom and Zoom¨
The Zero is forced to turn up and around to prepare for the Corsairs next attack but this pilot is losing more energy, getting slower and slower, easier and easier to kill because it is a less performance plane to start with and started the fight at altitude (energy) disadvantage. Less reserve energy.
Until finally, the Zero pilot is all out of energy and stalls, then gets killed or, chooses not to stall his plane but also not get the nose of his Zero around to meet the next attack and gets killed by diving deflection shot.
If the Zero chooses not to go head to head against the Corsair, to perform a defensive move and avoid the diving Corsairs guns the Corsair follows through on his dive and repeats the above mentioned attack again and again. The Zero will eventually run out of altitude, when he is out of altitude he will be out of the reserve energy needed to perform the defensive move to avoid the diving Corsairs guns.
So he stalls, crashes into ocean or land, or gets killed by diving deflection shot as mentioned above.
None of that probably made much sense but as mentioned before, it´s almost impossible to describe with words alone.