The match was held at Riggs home court. Riggs was a base line player and before the match, it was later discovered he had the court resurfaced to severely slow down the game which gave him a huge advantage. The match against King was on a neutral court and he was trashed.
Glad you brought up Riggs. He not only beat her, he beat her easily. He could have beat King too IMO, but threw the match. Riggs was such a shady character, who knew what was going on there.