By Wilton Jackson The 20-time Grand Slam champion shared tears of joy as he walked into his retirement after Friday’s defeat. The historic career of the first man to win 20 Grand Slams has come to an end. Roger Federer ends his 24 years of dominance on the tennis court after he and Rafael Nadal lost in a doubles match to Frances Tiafoe and Jack Sock in a final tiebreaker, 4-6, 7-6 (2), (11-9) at the Laver Cup on Friday in London. Sock ripped off a massive forehand shot down the line to bring an end to one of the greatest male tennis players in the history of the sport. But as Federer’s renowne…