She also held a 13-month , 51-match winning streak , from March 2006 until April 2007 . In April 2007 she finally lost to Natalie Grinham in the final of the 2007 Seoul Open . She also held a 13-month , 51-match winning streak , from March 2006 until April 2007 , when she finally lost to Natalie Grinham in the final of the 2007 Seoul Open .