 Federer 's main accomplishments as a junior player came at Wimbledon in 1998 , where he won both the boys ' singles final over Irakli <unk> , and in doubles teamed with Olivier <unk> , defeating the team of <unk> <unk> and Andy Ram . In addition , Federer lost the US Open Junior final in 1998 to David Nalbandian . He won four <unk> junior singles tournaments in his career , including the prestigious Orange Bowl , where he defeated Guillermo <unk> in the final . He ended 1998 with the No. 1 junior world ranking , and he entered his first tournament as a professional during 1998 in <unk> , where he lost to Lucas Arnold <unk> in the first round . 
