By Michael Shapiro Perhaps the greatest men’s player in history plans to retire after next week’s event. Tennis legend Roger Federer announced Thursday he plans to retire from the ATP Tour following his appearance at the Laver Cup in London next week. Federer, 41, is one of the most decorated players in history. His 20 Grand Slam titles rank third all-time among male players, trailing only Novak Djokovic and Rafael Nadal. Federer has a record eight Wimbledon titles, and he was the world’s No. 1 player for 237 weeks from February 2004 to August 2008. The Swiss star has battled a number of injur…