PHOTOS: Classy Medvedeva bags world figure skating title on debut

Russian teenager Evgenia Medvedeva put on a flawless display with a record-setting free skate to cap a stunning debut senior season with the women's title at the world figure skating championships in Boston on Saturday.

The 16-year-old combined seven triples with exquisite spins as she tallied 150.10 in her four-minute program that ended with her thrusting both fists in the air in triumph as she broke the record set by South Korea's Kim Yuna at the 2010 Olympics.

Medvedeva finished with 223.86 points overall to add the world crown to her Grand Prix Final and European titles, finishing 8.47 points ahead of Ashley Wagner, who claimed a first podium place in 10 years for an American in the event.

"I won't realise quickly I won today because one year ago, I was still skating juniors," she told reporters through a translator.

"Actually I don't really have any emotions right now... I left everything on the ice."

Fellow Russian Anna Pogorilaya finished third and American champion Gracie Gold, who led after the short program, fell early in a nervous performance to drop down to fourth.

Medvedeva also became the first women to win world junior and senior women's titles in successive years.

Earlier, Canadians Meagan Duhamel and Eric Radford came from behind to successfully defend the pairs title they won in Shanghai 12 months ago.

The Canadian duo had struggled for most of the season since that triumph in China but Duhamel and Radford found their form with a personal-best free skate score of 153.81 points for a 231.99 total.

They skated to Adele's "Hometown Glory" and were the only pair to land a quad throw Salchow. "It was an out-of-body experience," Duhamel said. "How did we just do that? It's like a dream."

China's Sui Wenjing and Han Cong, who led after the short program, struggled with a poor free skate to settle for a silver medal for the second straight year.

The Chinese pair led by 2.67 after the short program but could only manage a score of 143.62 for 224.47 total points. Five-time champion Aliona Savchenko of Germany and new partner Bruno Massot, skating together at a world championships for the first time, took bronze with a 216.17 total.