( CNN ) -- Former world No . 1 Caroline Wozniacki has fired Spanish coach Ricardo Sanchez after just two months and decided to return to working with her father Piotr . The Dane slipped to fourth in the WTA rankings after a quarterfinal exit at the recent Australian Open , where she once again failed to secure a first grand slam title . Troels Christensen , a journalist with the Danish newspaper Ekstra Bladet , told CNN how Sanchez had struggled to penetrate the close bond Wozniacki enjoys with her Poland-born father . `` Caroline and Piotr are mentally very tight , '' Christensen said . `` It 's very hard to break into the circle . He is not the first one has experienced that . `` It was more Piotr 's idea than Caroline 's and I do n't think she ever got used to him . They had agreed that they should sit down after the Australian Open and discuss the situation . '' Christensen said the tactical advice Sanchez gave Wozniacki during last month 's Melbourne grand slam appeared to be ignored by the 21-year-old . `` He must have seen that his input did not come out on the court . When the Danish press confronted Caroline with his analysis , she would not comment , '' Christensen said . `` I sensed when I got to Melbourne that something was wrong because the Wozniacki team are usually in good spirits , but they were not this time . '' Despite the split with Sanchez , Christensen stressed that there was still a high level of respect between the three . `` They like him very much and they 're good friends . In my opinion they should have been more clear about who should do what and who is entitled to do what before they started working together . '' Wozniacki 's failure to capture a grand slam title during her spell at the top of the world rankings meant she faced constant questioning on the subject . Christensen said Wozniacki is also now facing criticism from a vocal minority of Danish tennis fans who find it hard to identify with her lifestyle . `` There is a part of the Danish population who are irritated by her and think that she is not very Danish , she 's very Polish in her ways because of her father , '' he said . `` They say , 'She is living in Monaco , not paying her taxes blah blah blah ... ' But I think it 's a minority , but they are very loud . If you see the forums and newspapers ' websites , people are a little bit skeptical about her chances of winning a grand slam . '' Wozniacki will look to return to winning ways at this month 's WTA tournament in Qatar , where last year she lost in the final . This year 's entry list includes new No . 1 and Australian Open champion Victoria Azarenka .
Caroline Wozniacki fired coach Ricardo Sanchez just two months after hiring him . The former world No . 1 will now once again be coached by her father Piotr . Danish journalist Troels Christensen believes Sanchez struggled to add tactical input . Christensen also believes there were problems within the camp prior to the Australian Open .