The USA's Gwen Jorgensen proved she is a leading contender in 2013, as she claimed back to back ITU World Triathlon Series titles in Yokohama on Saturday, ahead of Australia's Emma Moffatt and Great Britain's Jodie Stimpson.

Injury has delayed Jonny Brownlee's start to the season, but he is fit and ready to roar in Yokohama this weekend

Japanese media turned up in large numbers to welcome the ahtletes at the ITU Elite Athlete Press Conference in Yokohama, with Javier Gomez, Joao Silva, Jonathan Brownlee, Gwen Jorgensen and Maaike Caelers taking the stage

The World Triathlon Series touches down in Yokohama this weekend, with Joao Silva returning to defend his back-to-back titles in the men's race, while the women's race is open for the taking.

It was his first race since the London 2012 Olympic Games, and Alistair Brownlee showed nothing had changed with another classic all round performance leading to his 13th ITU World Triathlon Series win in San Diego.

Gwen Jorgensen ran her way into the history books in San Diego on Friday, becoming the first U.S woman to win a World Triathlon Series race on the back of a scintillating final leg, ahead of Non Stanford and Emma Moffatt.

Alistair Brownlee, Sarah Groff, Matt Chrabot and Felicity Abram address the media at the official press conference in San Diego

They are two of the greatest male triathletes ever and will go head to head once again at the ITU World Triathlon Series San Diego this weekend.

The second round of the ITU World Triathlon Series touches down where it all started in the birthplace of triathlon in San Diego this weekend with some of the top names set to compete.

World champion Jonathan Brownlee will miss the San Diego World Triathlon Series event on April 20 due to an ankle injury.