The South Australian teenager was trumped by Canada's Filip Peliwo 7-5 6-4 in the final on Court One in 92 minutes in London.
Saville defeated the north American at the Australian Open boys' final but was unable to repeat the result in sunny conditions following early morning rain in SW19.
The Australian had been attempting to become the first player since American Billy Martin in 1974 to win the title on consecutive occasions.
"It was a pretty average performance on my behalf," Saville said.
"I felt a lack of rhythm out there and I had about a ten-minute hit this morning before it rained again and again this morning.
"I served extremely poor today but I can't take anything away from Filip and that is why he won. He was much better."