The couple are both sponsored by sportswear giant ADIDAS and met at a product launch.
The Swiss, who retired three years ago because of chronic injuries, enjoys romantic liaisons with Campbell, 30, as often as she can, but their busy schedules mean they spend most of their time apart.
Hingis says, "I like Sol a lot and we see each other whenever possible but he has many matches and I have my appointments. It is not easy."
But the 24-year-old isn't sure if they are in love yet, explaining, "That's too strong a word."
Campbell enjoyed a brief relationship with British singer Dido last year (04).15/02/2005 13:48