 In 2007 , Federer reached all four Grand Slam singles finals , winning three of them again . He won the Australian Open over Fernando González and did so without dropping a set . This made him the first man in the 21st century to accomplish the feat , as Björn Borg at the 1980 French Open was the last to win a Grand Slam tournament without the loss of a set . Federer had entered the year on a huge winning streak and after capturing his fourth Dubai crown Federer 's winning streak stood at 41 matches , the longest of his career and only five shy of the record . Federer entered Indian Wells as the three @-@ time defending champion , but his streak would end in controversy . He was defeated by an Argentine , Guillermo <unk> , who had failed a drug test for illegal doping . This surprising first @-@ round defeat marked the first time since August 2006 he suffered defeat , a period spanning over seven months . 
