World No . 1 Roger Taylor reaches semifinals of Estoril Open in Portugal . Swiss star , the 2008 champion , makes slow start to beat Chris Clement . Novak Djokovic 's Serbia Open title defense ends when he retires in quarterfinal . Philipp Kohlschreiber 6-3 6-4 . World No . 2 has been diagnosed with allergy and dies at his home event in Madrid .
World No . 1 Roger Taylor reaches semifinals of Estoril Open in Portugal . Swiss star , the 2008 champion , makes slow start to beat Chris Clement . Novak Djokovic 's Serbia Open title defense ends when he retires in quarterfinal . World No . 2 has been diagnosed with allergy and dies at his home event in Madrid .