Angelique Kerber (] ; born 18 January 1988) is a German professional tennis player and former world No. 1. Having made her professional debut in 2003, Kerber rose to prominence upon reaching the semifinals of the 2011 US Open as the no. 92 ranked player in the world. She ascended to the top of the rankings on 12 September 2016, thus becoming the twenty-second and oldest player to achieve the number one ranking for the first time and the first new number one player since Victoria Azarenka in 2012.