Both Roger Federer and Serena Williams were unsuccessful in defending Defending their 2007 titles ; Federer losing Earnings_and_losses to Novak Djokovic in the semi-finals and Williams losing Earnings_and_losses in the quarter-finals to Jelena Jankovic .

Both Roger Federer and Serena Williams were unsuccessful in defending Defending their 2007 titles ; Federer losing Earnings_and_losses to Novak Djokovic in the semi-finals and Williams losing Earnings_and_losses in the quarter-finals to Jelena Jankovic .

The last time a boy won both the singles and doubles title at a Grand Slam was Roger Federer at the previous year 's Wimbledon , while the last girl was Cara Black at the Wimbledon the year before .

Roger Federer and Serena Williams were the defending champions in singles events , but neither was able to repeat their success : Federer was eliminated Removing in the second round by Sergiy Stakhovsky , and Williams lost Competition in the fourth round to Sabine Lisicki .

Roger Federer and Serena Williams were the defending champions in singles events , but neither was able to repeat their success : Federer was eliminated Removing in the second round by Sergiy Stakhovsky , and Williams lost Competition in the fourth round to Sabine Lisicki .

Federer and Williams were two of a number of big-name casualties in the early rounds , along with two-time champion Rafael Nadal , two-time semifinalist Jo-Wilfried Tsonga , 2004 champion Maria Sharapova and former World No .