Roger Federe against Andy Murray 6–2, 7–5, 6–2
Roger Feder won the men's singles title 3 times - 2011, 2006 & 2005. Two players have won the title twice - Andy Murray in 2009 & 2008 and Stefan Edberg in 1995 & 1994.
Venus Williams won the Wimbledon Women's singles title in 2008. She defeated Serena Williams in the final. This was Venus Williams' fifth Wimbledon Singles title.
"Yes, Elena Dementieva is a retired Russian tennis player. The highlight of her career was winning the gold medal at the 2008 Bejing Olympics in women's singles tennis. She retired on October 29, 2010, positioned at number 9 in the world."
Maria Sharapova
According to documented information that is available on the internet it states that a tennis player by the name of Venus Williams was the defending champion and won the final in the Wimbledon tennis tournament in 2008. Venus Williams played against her sister Serena.
Rafael Nadal of Spain won gold in men's singles tennis at the 2008 Games in Beijing.
Rafael Nadal
The winner of the 2008 Olympic Games Men's Singles Gold Medal was Ma Lin of China. The winner of the 2008 Olympic Games Women's Singles Gold Medal was Zhang Yining of China. The winner of the 2008 World Team Championships for men was China. The winner of the 2008 World Team Championships for women was China. The winner of the 2008 World Cup Men's Singles title was Wang Hao of China.
If by '2008 men's single' you mean Wimbledon, then Rafael Nadal. Nadal also beat Federer in the French Open.
It was Elena Dementieva
Venus Williams
Venus Williams.