Venus Williams was just 20 years old when she won the gold medal in singles at the 2000 Olympics. She was the first African-American woman to win a gold medal in tennis.
Serena Williams was the defending champion in singles at the 2012 Olympics, but she was upset in the semifinals by Maria Sharapova. It was the first time that Serena had lost a match in the Olympics.
Andy Murray is the only tennis player to win two singles gold medals at the Olympics. He won his first gold medal in 2012 and his second in 2016.
Novak Djokovic is one of the greatest tennis players in the world, but he has never won an Olympic gold medal. He did win a bronze medal in 2008, but he was upset in the semifinals by Roger Federer.
Roger Federer is one of the greatest tennis players in the world, but he has never won an Olympic gold medal. He did win a silver medal in 2004, but he was upset in the final by Nicolas Massu.