Siobhan-Marie O'Connor dazzles in 200IM heats at 2016 Rio Olympics

Siobhan-Marie O'Connor will be in lane one for Tuesday's 200m individual medley final as she bids to becomes Britain's first female swimmer to win a gold medal at Rio.

O'Connor set a new British record in her heat with a time of 2:07.57, and also posted a better time than the favourite for the event, Katinka Hosszu.

Fellow Brit Hannah Miley, whose time gave her joint 12th, did not do enough for a place in the final.

Elsewhere in the pool on Monday night, controversial Russian Yulia Efimova had to settle for silver in the women's
100m breaststroke final.

Lilly King of the United States won gold in an Olympic record of 1:04.93.

Efimova, who has been booed at the pool after her late challenge to be included in the Games despite being initially banned by the International Olympic Committee, finished in 1:05.50. USA's Katie Meili took bronze in 1:05.69.

Defending champion Ruta Meilutyte, the Lithuanian based in Plymouth, was seventh in 1:07.32.

British world champion James Guy was fourth in the men's 200 metres freestyle on day three of the Rio Olympics as China's Sun Yang won gold.

The 20-year-old Guy was unable to emulate team-mate Adam Peaty, who won 100m breaststroke gold on Sunday, a valiant effort from lane eight leaving him 0.26 seconds outside of a medal.

Sun, who served a lenient doping suspension between London 2012 and Rio, won in one minute 44.65 seconds.

South Africa's Chad le Clos was second in 1min 45.20secs and Conor Dwyer of the United States third in 1:45.23.

Guy clocked 1:45.49 and world record holder Paul Biedermann of Germany was sixth in 1:45.84.