Bianca Andreescu, 21, revealed the pressure and stress she was putting on herself was one main of the reasons why she ended in a dark spot as she hopes that she will avoid making the mistakes now that she has returned to tennis following a lengthy absence. Last December, Andreescu posted a message on her social media, announcing her withdrawal from the Australian Open. In the message to fans, Andreescu said the past two years had been extremely difficult for her and she needed some time to reflect on everything and work on herself. After skipping the first three and a …