London: Six-time Major winner Boris Becker yesterday feared that tennis could be lacking big personalities and its popularity might sink in the near future if Roger Federer and Rafael Nadal call time on their careers.
The former World No 1 said the modern generation of male players have strengthened the image of tennis and there is huge expectation surrounding the upcoming Wimbledon tournament, with World No 1 Novak Djokovic, Federer, Andy Murray and Nadal targeting the title.
"I think the men's side is in a very healthy state, we have an increase in popularity from over 10 years ago and the numbers are staggering," Becker was quoted as saying by skysports.com.
"But the question has to be asked: what if Roger decides to quit or Rafa is not coming back? It's impossible to carry on with only Novak and Andy," he said.
Becker, who coaches Djokovic, has raised concerns about the shortage of consistent challengers outside the top four.
"In two or three years' time, we have to be careful," said the 47-year-old.