American legend Pete Sampras has lamented the decline of US men's tennis, saying he doesn't know anyone capable of breaking into the top ranks for his home country.
The 14-time grand slam winner on Monday blamed the increasingly global and competitive nature of top-level tennis, saying it would "take time" before American men were dominant again.
"We haven't had anyone at the top for a long time now," said Sampras, who dominated the game along with compatriot Andre Agassi before retiring in 2002.
"It takes time to get American tennis back to where it was.
"The game has become so international. Players are playing all around the world.
"The world is getting hungrier and we (the US) are just not producing young kids with potential.
"Hopefully it's just a phase and doesn't last too long (to return to the top)."
Sampras, who retired at the age of 32, predicted the three big names of Novak Djokovic, Roger Federer and Rafael Nadal would continue to dominate next season.
"Novak Djokovic is the obvious choice. Roger is very motivated to get to No.1. Rafa is uncertain with his health but I feel like once he's healthy he'll be in the mix," he said.
But the 43-year-old said Bulgarian Grigor Dimitrov, ranked 11 in the world, was one to watch.
"Grigor is someone that I think is ready to make that next step," he said.
"He's showing signs but I think he just needs to learn how to win but he's got the talent."
"I still see those three guys dominating. I see guys threatening them but when push comes to shove, I think you'll see those three guys in the second week of majors, in the semi-finals and finals.
"It's going to be an interesting year but I still see Novak, Roger and Rafa being the cream of the crop."
Sampras lost his opening match at the new International Premier Tennis League on Sunday to veteran Australian Pat Rafter in the third leg of competition in Delhi.
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