OMNISPORT

History will be made on day three of Rio 2016 when the first rugby sevens gold medal is handed out in the women's competition, one of 14 golds on offer across eight sports.

As Serena Williams looks to keep her Olympic title hopes alive in the women's singles, we bring you the key things to look out for on a busy Monday in Brazil.

DELPO BACK FOR MORE

Fresh from his sensational victory over world number one Novak Djokovic on Sunday, Juan Martin Del Potro returns for his second round match with Portugal's Joao Sousa.

The Argentine has been beset by wrist problems over the last two years, but his display of crisp groundstrokes was too much for Djokovic - causing the first major upset of the tennis competition.

Another shock saw three-time doubles champion Serena Williams knocked out alongside her sister Venus, but the women's number one will be back in singles action against Alize Cornet.

HISTORY IN SEVENS

After 92 years without a rugby competition at the Olympics, the women's rugby sevens tournament will come to a close on Monday with the semis and final taking place.

Favourites New Zealand face a tough test against Great Britain in the last four, while Australia and Canada will contest the other in the battle for the medals.

CAN HOSSZU DOUBLE UP?

Prior to Katie Ledecky and Adam Peaty producing stunning wins on Sunday, Katinka Hosszu had set the bar high with her dominant victory in the 400-metre individual medley.

The 27-year-old can become one of the first double gold medallists of this Games when she competes in the 100m backstroke - although Kathleen Baker goes into the final as the fastest qualifier.

Elsewhere in the pool, two controversial figures could claim medals as Sun Yang and Yulia Efimova compete in the 200m freestyle and 100m breaststroke respectively - both athletes having previously served doping bans.

CHOPPY WATERS

Rowing returns to schedule on Monday after strong winds saw Sunday's competition postponed at the Lagoa Stadium.

The regatta has taken place under tough conditions so far, the Serbian men's pair suffering the ignominy of capsizing as waves swelled during their heat on Saturday.