Nick Kyrgios hates being compared with Bernard Tomic

Kyrgios, who concedes not getting over grandmother's death, says he means what he says, unlike fellow Australia tennis star who seems confused.

Team Australia's Nick Kyrgios returns the ball during a practice session prior to the Davis Cup World Group tennis semi-final in Brussels. Geert Vanden Wijngaert / AP Photo

Nick Kyrgios concedes he has not fully committed to his career since the death of his grandmother two years ago.

The Australian, who is ranked 20th in the world, suffered another early grand slam exit at the US Open last month and has endured numerous peaks and troughs throughout a tempestuous career in top-level tennis.

He says his desire to lead "a normal life" is in conflict with his hunger to win tour matches, but rejected comparisons with another disaffected Australian player, Bernard Tomic.

How Kyrgios can be

"My grandmother, Julianah Foster, passed away two years ago. I didn't get to spend the time with her [like] I wanted to and tennis was the reason for that. It kept me away from her. It's something that still gnaws away at me," he told the Players Voice.

"If I'm honest, I'd say I haven't committed to tennis the way the game needs me to since she died.

"There is a constant tug-of-war between the competitor within me wanting to win, win, win and the human in me wanting to live a normal life with my family away from the public glare."

Kyrgios, who was eliminated in the first round at Wimbledon but won a Masters 1000 series title in Cincinnati prior to his US Open disappointment, insists there is no comparison between him and Tomic, who conceded to feeling "bored" during his defeat to Mischa Zverev in straight sets at Wimbledon.

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"[Tomic] has lost his way," Kyrgios said. "He needs to figure out what he wants to do. I can't relate to anything he says any more. He says one thing and he does the other. And he contradicts himself all the time.

"He says tennis doesn't make him happy, that he doesn't really like the game, yet he says the only thing that will really make him happy is winning a grand slam. It doesn't make sense at all.

"I can honestly say winning a grand slam would not make me the happiest person on earth. As I wrote previously, I just love being a normal guy and having enough money to live a normal life. I don't need the excess money at all. We're a lot different."

Tomic said at Wimbledon in July: "I couldn't care less if I make a fourth round at the US Open or I lose first round. To me, everything is the same. I'm going to play another 10 years, and I know after my career I won't have to work again."