MELBOURNE (Reuters) - World number one Simona Halep, flying solo after parting ways with coach Darren Cahill, feels refreshed after a long lay-off to recover from a back injury but also concedes she has risked her Australian Open campaign with scant preparations. Tennis - Australian Open - Melbourne Park, Melbourne, Australia - January 10, 2019 - Simona Halep of Romania during practice. REUTERS\/Kim Kyung-HoonFrench Open champion Halep warmed up for her run to the final at Melbourne Park last year by winning the Shenzhen Open in southern China but has played only one match since September, a 6-4 6-4 defeat to Australia\u2019s Ashleigh Barty at the Sydney International on Wednesday. The top seed said her back had recovered \u201c100 percent\u201d from a herniated disk aggravated at the China Open in September, however, she revealed she was also feeling a bit behind the curve. \u201cI am motivated. But it\u2019s a little bit different because last year I had about 10, 15 matches before Melbourne, now I have only one, which I lost,\u201d the Romanian told reporters at Melbourne Park on Saturday. \u201cI took the risk staying home a little bit longer. I rested because I felt like I\u2019m exhausted after those tournaments and also the year that I had. \u201cI enjoyed the time at home a lot. Now I feel refreshed to start the year, but still I am a little bit back with everything, preparation and matches. \u201cBut I don\u2019t complain. Everything was how I wanted. So now I have just to put my head down and to go and work.\u201d Her opening shift is a daunting one, against Kaia Kanepi, the same woman who knocked her out of the first round of the U.S. Open. The shock loss to the unseeded Estonian made Halep the first top seed to fall at the first hurdle at Flushing Meadows. Her former coach Cahill delivered the news of the re-match by text message after doing the draw at Melbourne Park on Thursday. \u201cYou really want to know?\u201d Halep smiled, after being asked how she reacted. \u201cI was at Nike taking my new shoes. When I saw the message, I was like, \u2018Okay, whatever. I just enjoy the moment with the shoes, then I\u2019ll think about the match\u2019. That\u2019s it.\u201d Cahill quit Halep\u2019s team for \u201cfamily reasons\u201d and the Romanian said she would proceed without a coach for the first few months of the season. She was not interested in hiring coaches on short-term gigs, wanting to take time to pick the right one. \u201cFor me it\u2019s a little bit tough to change the person I\u2019m working every day because I get attached to the people, to my team. I cannot change fast,\u201d said Halep, a gallant loser to Caroline Wozniacki in the Melbourne final last year after carrying a painful ankle injury through the tournament. Tennis - Australian Open - Melbourne Park, Melbourne, Australia - January 11, 2019 - Romania's Simona Halep trains. REUTERS\/Edgar Su\u201cEvery time you commit to someone in your team, you have to give 100 percent. \u201cAs I say always, at this level it is impossible without a coach. So maybe in the close future I will have someone. But for the moment, I\u2019m just by myself.\u201d Editing by Greg StutchburyOur Standards:The Thomson Reuters Trust Principles.