Stephen Maguire has a habit of going under the radar.
The Scot chalked up a 5-3 win and landed a place in the semi-final at the expense of the world number two.
Maguire hadn't faced any major tests so far in Newport until day, but he didn't suffer from rust.
His chances of winning the match were as good as written off with Williams in such fine form, and that may just have helped him.
But he didn't do it the easy way. He had to recover from 3-2 down to win the match.
He'll face Mark Selby in the last four.
The Jester has come in for a lot of criticism this wek but that won't bother him as he booked his place with a 5-3 win over Graeme Dott.
Selby has never been the most attacking player but for some reason, his style of play has come under sharp scrutiny over the past few days.
The Leicester man has never been one to struggle in adversity though. He could well have the last laugh and win the Welsh Open now.