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Australia's Bernard Tomic reacts during his second round match against Japan's Kei Nishikori.
Tomic won the clash 6-3, 6-4, with both players preparing to compete in the Australian Open when the tournament commences in Melbourne next week.
"I guess it's not doing what I've been doing", said a player who quit the 2018 season in October with an elbow injury and then played basketball and worked with his charity in the off-season.
Tomic's first set was nearly flawless, while Kyrgios looked a little underdone and struggled to find some rhythm early on.
Chastened somewhat, Tomic began to rebuild his game last season, winning his first title since 2015 at Chengdu last September and he appears to be carrying that momentum forward.
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World No 51 Kyrgios said he was happy to see Tomic back in form after missing the Open a year ago when his ranking plummeted.
Kyrgios, who lost in the second round in Brisbane last week, had a break-point early in the second but was unable to consolidate with Tomic then breaking at 3-3.
Now ranked 85, Tomic finished the year in style with an ATP title in China. He added: "I know this Australian Open is going to be big as well. and I can do a lot better than I've done in the past".
"I just wanted to get out here today and hit some serves, get that match preparation, face some serves", he said.
"I feel like a veteran at this stage, I just need to make sure the body is right".
"I think it's an exciting time for Australian tennis as we've got such a wide variety of players".
"I've been to the fourth round (of grand slams) so many times, two quarter-finals and I've had some tough matches in those rounds".