London 2012 Olympics: Alan Campbell leads way as Great Britain reach 12 finals at Rowing World Cup While Tanner was wary of making definitive predictions for how the Lucerne finals would unfold, two golds would seem at least highly likely: the first for the all-conquering men's four, who shattered the world record in Friday's heat, and the second for the dominant women's double of Anna Watkins and Katharine Grainger. Beyond these boats, there remains a strong chance for the women's pair of Helen Glover and Heather Stanning, who surged to win on Saturday in 6:56.61. "The conditions have been fun," reflected Stanning, after another day in which a stiff following wind helped produce stunning times. Glover and Stanning have established themselves as a pre-eminent crew in their event, alongside world champions New Zealand, and delivered a muscular masterclass in their semi to open up a canvas lead over the United States after 750 metres. The women's quadruple skull of Vicky Thornley, Beth Rodford, Frances Houghton and Mel Wilson banished the memory of a pedestrian heat by prevailing in their repechage in 6:19.69. One concern, though, hovered over an underwhelming race by the lightweight men's double of Zac Purchase and Mark Hunter, pitched directly against main adversaries Canada and New Zealand. The British duo started on a tear, assuming the 500-metre lead before fading alarmingly. Only by looking across the lanes and realising the threat from Greece did Purchase muster a final push, securing qualification in third in 6:21.46. Tanner admitted he was concerned by the lapse. "They weren't quite at their best," he said. I've no idea whether they were just conserving their energy or weren't feeling well. It's hard to tell. According to Hunter, though, the race had simply been a matter of experimentation. We came here wanting to try new and different things, rather than playing it safe. The World Cups are the place to do this. It's all about developing and challenging ourselves, because the racing calendar is so compact.