Williams sisters top seeds in Rio

Rio de Janeiro - Williams sisters, Serena and Venus, will be the top seeds in women's doubles at the Rio Olympics.

In men's doubles, three-time major winner Andy Murray and his brother Jamie are seeded second, behind the top-seeded French pairing of Pierre-Hugues Herbert and Nicolas Mahut.

In men's singles, the top seed is Novak Djokovic, with Andy Murray seeded second - mirroring their rankings.

Murray is the defending Olympic champion.

With third-ranked Roger Federer and fourth-ranked Stan Wawrinka both out with injuries, fifth-ranked Rafael Nadal is third in the Olympic men's singles seedings announced by the International Tennis Federation, the sport's governing body.

In women's singles, top-ranked Serena Williams is the top Olympic seed.

Williams is the defending champion in singles and in doubles with Venus.