The 43-year-old won 5-3 thanks to a top-quality performance in a bad-tempered match during which Lewis walked off stage accusing his opponent of gamesmanship.
It was no surprise that tactics were involved in a match featuring Manley, who refused to shake Taylor’s hand after his defeat in the 2002 final and on Thursday kept Dennis Smith waiting while he changed his shirt.
With Lewis leading 2-1 in legs having just hit double top, the 20-year-old suddenly stood back and walked off stage, appearing to claim that Manley had spoken when he was about to throw.
After composing himself backstage and a short conversation with referee Russ Bray, Lewis returned and gained the one leg he needed to make it 3-2, only for Manley to hit another superb finish, this time a 101, to regain his two-set cushion.
The youngster won set seven but Manley would not be denied and a 106 out-shot wrapped it up, the match ending with a terse handshake.
Manley defended his actions and insisted it was part of a learning process for Lewis.
“It was very hot on stage and blood boiled,” he said. “There were a few little incidents and maybe Adrian wanted to blame someone else because he didn’t play as well as he had all week.”
The first quarter-final was a much more serene affair, and Wayne Jones strolled through 5-0 as Gary Welding failed completely to reproduce the form that earned him victory over top seed Colin Lloyd in the first round.
Phil Taylor will meet Wayne Mardle in the other semi-final after both recorded comfortable victories.
The Power eased past Kevin Painter 5-1, while Mardle beat Alan Warriner-Little 5-0.