Green Lantern actually can win this, but that would mostly be from Hal using abilities that are forgotten about. Mainly becoming invisible, intangable, opening portals in space, and the fact that no one wearing one of the original corps rings can be killed in battle. Still would be an interesting fight.
No Sinestro killed those who wore the rings of the reconstructed Corps, not the original Green Lantern Corps. So long as the ring has any charge to it and it is on the body of the Green Lantern, they can't be killed. Look at what happened when Hal went rouge as an example as non of the Lanterns he defeated died until after the ring was removed. Wounded greatly yes but not mortally wounded in battle. Also Hal has saved exploding planets, restarted stars, and has proven himself to be able to hold his own against foes as strong as Goku (the forces of planet Apokalips for instance). All Goku has going for him is that he gets physically stronger and more energy abilities so essentially he is a one-trick pony, Hal has greater adaptability and has faced a far greater range of foes so I put my money on Hal.
No I watched DBZ, read the Manga, and know what I am talking about. Green Lantern is powered by the combined life force of all life in the universe and is limited only by his will and imagination. Goku is powered by only his inner energy and sometimes can summon a spirit bomb from life of a planet or galaxy. May I suggest you learn to spell, do some research, and respect those you disagree with. Goku is strong but not unbeatable and all Hal would have to do is think outside the box to beat him.
Hal couldn't think at the speed goku fights and a punch from goku is like getting hit by a meteorite travelling at the speed of light or faster his body or his ring caint handle that type of pressure and about my spelling I'm using my phone and this isn't no spelling b last time I checked you still understood what I was trying to say and goku also can asorb the suns , energy or spiritual energy from the univers and so on Hal wouldn't be prepared for this type of warrior
He has dealt with cosmic entities more powerful than Goku numerous times and can manipulate time itself. Anything he can imagine the ring can do or make. Hal can hold his own and even beat Goku as Goku is not unstoppable and has even been killed. I am respecting both characters while you see Goku as some Deus Ex Machina who can swat anyone away with a single hand.