Rachel Joyce finished second in the women's event at the Ironman World Championships as three British athletes made the top 10 in Hawaii.
Switzerland's Daniela Ryf won the race ahead of Joyce, whose fellow Britons Susie Cheetham and Lucy Gossage finished sixth and 10th respectively.
Jan Frodeno won the men's title in Kona as temperatures topped 120F (49C).
"I had good run form, but it was brutal," said the German, who finished in eight hours 14 minutes 40 seconds
"There was no shade at all," he added after completing the 2.4-mile ocean swim, 112-mile bike leg and marathon run.
David McNamee was the top Briton in 11th, with Joe Skipper 13th and Tim Don two places further back.
Ryf won the women's race in 8:57:57 - finishing more than 13 minutes ahead of Joyce, with Australian Liz Blatchford third. It was the biggest margin of victory since Britain's Chrissie Wellington won in 2009.
GB's Leanda Cave was prominent in the swim but the Welsh competitor crashed during the cycling section.