ATP version of the WTA general tennis
Australia's Nick Kyrgios "lacks respect for the public, the rival and himself", says world number two Rafael Nadal.
The 17-time Grand Slam champion lost a dramatic second-round match to world number 72 Kyrgios 3-6 7-6 (7-2) 7-6 (8-6) at the Mexican Open in Acapulco on Thursday.
Spaniard Nadal, 32, said: "He's a player who in theory has the talent to win Grand Slams - a player who in theory has the talent to fight for the top rankings, but there's a reason he is where he is."
Kyrgios saved three match points before beating Nadal, who was playing his first tournament since losing to Novak Djokovic in January's Australian Open final.
Nadal said: "He is a very dangerous player but lacks consistency.
"I don't think he's a bad guy. I think he's a good guy."
Krygios seems afraid to really put it all on the line and fail, which is why he wants to give the impression he doesn't really care about winning or losing. It's quite the opposite. He doesn't want to show he wants to win but fails. Sadly, he'll end his career with sour grapes.