LONDON—Eight-times champion Roger Federer survived a massive scare against Adrian Mannarino before advancing to the Wimbledon second round on Tuesday when the Frenchman retired with a knee injury after slipping on court. The match was poised at 6–4 6–7(3) 3–6 6–2 with Federer forcing a fifth set before Mannarino, celebrating his 33rd birthday, decided he could not continue. “It’s awful,” Federer said in his on-court interview. “It shows that one shot can change the outcome of a match, a season, a career. I wish him all the best and I hope he recovers quickly so we see him back on the courts. “He could have won the match at the end. Obviously, he was the better player, so I definitely got a bit lucky.” Federer, seeded sixth, was serving with a 4–2 lead in the fourth set when the 41st-ranked Mannarino slipped while attempting a return and twisted his right …