Britain's INEOS Britannia has selected Switzerland's Alinghi Red Bull Racing as their opponents for the America's Cup challenger semifinals, which begin this weekend in Barcelona. This decision came after Britannia topped the round robin series and won a sail-off against Italy's Luna Rossa Prada Pirelli, who will now face the U.S. team, American Magic. Each semi-final requires teams to achieve five wins to advance to the Louis Vuitton Cup final, ultimately leading to a challenge against New Zealand for the coveted 'Auld Mug'. Sir Ben Ainslie emphasized the strategic nature of their choice, while Swiss skipper Arnaud Psarofaghis expressed eagerness to compete against the top-performing British team. The U.S. team will be without their key helmsman, Paul Goodison, due to injury, with Lucas Calabrese stepping in. This year's competition features high-tech AC75 foiling mono-hulls that can reach speeds near 50 knots, adding to the excitement of the match-ups.