Superman VS Swamp Thing (Rebirth)
Not really a serious fight, you can see Superman holding back and trying to get an explanation from Swamp Thing. But on the same token, it’s amazing to see Swamp Thing overwhelm Superman. In a real fight I think Superman has the edge but it’s not going to be an easy fight – Swamp Thing can call on the Earth for energy reserves the way Superman does with the sun.
From – Superman Vol. 4 Annual 1