Rio Olympic Games day two guide

Katie Ledecky and Adam Peaty will be fancied to break world records in the pool as Lizzie Armitstead goes for gold in what is sure to be an emotional women's road race.

As some of the bigger names get down to business, we bring you the key things to look out for on the second day of the Rio Games.

ARMITSTEAD FOCUSED ON THE ROAD

Silver medallist in the women's road race four years ago, Armitstead is among the favourites again, but her preparation has been hugely overshadowed.

The Team GB cyclist has been allowed to compete, despite missing three drugs tests inside a year, which should have triggered a ban.

Opinion over the decision has polarised fans rivals alike - French cyclist Pauline Ferrand-Prevot branded it "shameful" - giving the world champion plenty to think about, aside from how she will tackle a gruelling course which wiped out many men, including fellow Briton Chris Froome, on Saturday.

WORLD RECORDS UNDER THREAT IN THE POOL

Adam Peaty has already broken his won 100 metre breaststroke world record in this Games, and the swimming star has targeted doing so again in today's final.

Katie Ledecky will go for gold and plenty more in the 400m freestyle, while Sarah Sjostrom qualified in Olympic-record time for the 100m butterfly final.

Team USA's other stand-out superstar Michael Phelps could be in line for his first of six potential farewell golds as the American team tackle to 4x100m freestyle.

AN OLYMPIC FIRST ON OFFER

Guo Wenjun is on course for a slice of Olympic history in the women's 10m air pistol.

Reigning Olympic champion Guo has won gold in the past two Games, dominating her event at home in Beijing and in London.

A hat-trick will make her the first competitor in Olympic history to win a shooting event in three successive Games.

BILES BEGINS

Simone Biles has been pegged as the most dominant competitor in any sport at the Games and the gymnastics star gets going today.

Qualification to the final ought to be a formality for the 10-time World Championships gold medallist.

Sam Mikulak was Team USA's only discipline leader in yesterday's men's qualification, but Biles is likely to be the one to beat on every apparatus.