September 20, 2014 -- Updated 1847 GMT (0247 HKT)
Two former world No. 1s. Two tennis stars who have been unlucky in love with golfing partners. Two women who are getting their careers back on track.
Asia's first grand slam singles champion Li Na has called time on her 15-year tennis career due to "chronic" knee injuries.
There remains plenty to play for in tennis in 2014. Most notably, spots at the year-end championships are up for grabs for both the men and women.
Roger Federer beats Fabio Fognini to give Switzerland an unbeatable 3-1 lead over in the Davis Cup semifinal in Geneva.
Davis Cup guide
Open Court explores which country will finish the year holding the prestigious Davis Cup trophy.