The women's matchups Sunday to decide quarterfinal berths are: 15-time major champion Serena Williams against No. 15 Roberta Vinci, 2008 French Open titlist Ana Ivanovic against No. 4 Agnieszka Radwanska, 2009 champion Svetlana Kuznetsova against No. 8 Angelique Kerber, and 2012 runner-up Sara Errani against No. 20 Carla Suarez Navarro.

NPR: Djokovic's Day At The French Open Ends In Despair

Another golfer, Australia's Adam Scott, has recently rekindled his romance with glamorous Serbian tennis star Ana Ivanovic, the 2008 French Open champion.

CNN: 15-love: Top tennis romances

Since Ana Ivanovic took the top spot by winning the 2008 French Open, no No. 1 has played up to the part.

WSJ: Where's the Real Women's No. 1?