Roger Federer is adding Stefan Edberg to his team, part of a recent trend of top tennis players hiring ex-stars as coaches. Federer, owner of a record 17 Grand Slam titles, says Friday on Facebook that six-time major champion Edberg ''agreed to work with us for at least 10 weeks starting at the Australian Open.'' Federer refers to Edberg as his ''childhood hero.'' Severin Luthi will continue to work with Federer, too. In October, Federer split with coach Paul Annacone after 3 1/2 seasons together. More...