Williams, who suffered a shock opening round defeat at last year's French Open, has now won eight straight matches on clay this season.
Byrne has been a revelation in this Six Nations and his two tries against Italy added to his score in the shock opening win against England at Twickenham.
"I thought they might have set Cheryl and I up against each other in Minnesota, " Laimbeer said when asked about facing the Shock in the opening week.
The World No.1 will face Spain's Carla Suarez Navarro in the semifinal, but says she is taking nothing for granted after her shock defeat in the opening round at Roland Garros last year.
After the much-fancied Spanish had slipped to a shock defeat in their opening game against Switzerland on Wednesday, they needed to produce a performance in front of a large contingent of their expectant fans at Ellis Park.
Earlier, France beat Georgia 64-7 in their final pool game, but were left to rue their shock defeat to Argentina in the opening match of the tournament.
Pakistan failed to qualify for the Super 8 phase after losing their opening game to West Indies and suffering a shock at the hands of Ireland on Saturday.
But flashes of individual brilliance from striker David Villa and fit-again midfielder Andres Iniesta sealed a last-16 clash against Portugal on Tuesday as they ran out Group H winners despite a shock defeat to Switzerland in their opening match.
The result, secured thanks to Pumas tries by Felipe Contepomi and Omar Hasan in the first half and Federico Martin Aramburu, Ignacio Corleto and Contepomi again in the second, brought back memories of the shock 17-12 win earned by the South Americans on the tournament's opening night.
But England's victory over Papua New Guinea in their opening match is almost certain to secure their qualification from their group - unless PNG can pull off a huge shock by defeating Australia on Sunday.
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