I've followed tennis for over 50 years and have usually had favourites I followed, but I have to admit I have never followed anybody as closely as Andy Murray. I think it's because he came on the tour in 2005 which was just when I got broadband, and could follow tennis all the year round. (tennis magazines were all very well but weeks, sometimes months, after the fact).
So I have watched him (at first on PAYG internet!) ever since he was a junior and feel I know him better than I know some of my relatives.