This past Monday, Caroline Wozniacki dipped to No. 8 in the WTA rankings, her lowest slot since early July of 2009. After back-to-back seasons of 63 and 62 wins, Wozniacki is a fairly pedestrian 20-9 so far in 2012 without a single tournament championship. Here's a quick look at the rise and fall of three former No. 1's with similar circumstances to Wozniacki.

Two-time former champions, Bob Bryan and Mike Bryan, bounced back from last week's second-round loss at the Madrid Open with a 6-3, 6-2 victory Wednesday over Santiago Gonzalez and Christopher Kas at Rome and advanced to the quarter finals today.

The blue clay of Madrid was enough to cause some shifts at the top -- including Federer back as the ATP's No. 2 and Serena continuing her climb up the women's rankings.

Number Crunch: More than two years pass before both Roger and Serena Williams win tournaments on same week.

Tennis celebrities celebrating birthdays between May 13-19, 2012.

Since Roger Federer is out-of-this-world amazing at tennis, Will Smith made him an honorary member of the Men in Black with a framed suit after his win in Madrid this weekend.

Ranked No. 340 in world, Sam Groth hit a 163mph fastball serve to break the record fastest serve record this weekend.