Twenty-time Grand Slam singles champion Roger Federer said Saturday he felt freed by his retirement from pro tennis, but wouldn't hesitate to relive his 25-year career.Speaking at a tennis clinic at Tokyo's Ariake Coliseum, Federer said his retirement in September opened his eyes to the weight and grind that playing on the world tour can take.Asked what had changed for him, the Swiss great said, "It's the things that have dropped away, the weight, the pressure...always thinking of your next practice, your next match.""It never lets you go, your next travel, your next packing. I don't think …READ FULL ARTICLE