4) Lleyton Hewitt and Kim Clijsters
Both Lleyton Hewitt and Kim Clijsters were extremely popular players during their playing careers. Naturally the fans got very excited when it became known that were ‘a thing’.
At 19, Hewitt began dating the Belgian Kim and one year later he became the youngest ever world number one. (Tennis Romances)
The couple announced their engagement in 2003 but then Hewitt called off the wedding a year later which broke Kim’s heart.