Johanna Konta has announced her retirement from professional tennis.Exclusive: Johanna Konta shares details of surprise engagement ahead of Wimbledon returnThe former British No 1, who reached the Wimbledon semi-finals in 2017 - the first British woman to achieve this in 39 years, made the announcement on her social media pages, with a post headed "Grateful".WATCH: Kate Middleton makes surprise appearance at Wimbledon"This is the word that I've probably been used to the most during my career,