Complete and utter oppression and domination. That was how all of the Fire Lord's matches went.
Though I didn't see him meeting any truly powerful cultivators, most of the people he fought were still at the least in the Void Stage realm. These cultivators had ground and fought, climbed through and on top of many corpses to become who they are today. Yet they all failed in crossing the final barrier.
A wall as tall as a mountain, burning with endless rage and incredible flames.
The Fire Lord was the end of all those who tried to fight against him.
Ten rounds, ten perfect victories, and he proceeded to the final phase without any hitch or worry.
"Indeed, the man you called the Fire Lord is truly powerful. How did you even survive fighting him?" the Dusking Sun said
