Seven-time singles champion Williams had fulfilled Murray's search for a partner -- world number one Ashleigh Barty had been previously mooted.

However, as the match loomed on Centre Court her nerves began to jangle as she feared she would let down Murray on the court where he won two Wimbledon singles titles and the 2012 Olympic.

"At some point I started feeling a lot of pressure," said Williams.

"Oh, my God, I have to do well because this match is so hyped that I want to see it.

"I didn't even want to be in it, I kind of just wanted to watch it.

"Maybe I'll try to get a video of it or watch it somewhere.

"Overall I think I was able to handle my nerves pretty good, do better than I thought I was going to do."

Murray and Williams -- both former world number ones -- had little trouble in dispensing with their opponents.

"Obviously I had lost in the doubles earlier (with Pierre-Hugues Herbert) so all my energy is focussed on the mixed but it was a good start," said Murray.

Murray said physically he felt fine after two matches in one day, save for a stiff back.

The hip he had 'life-changing surgery' on earlier this year had not given him any trouble.

"I feel good and am happy to be alive in this," said Serena.