WIMBLEDON, England—Novak Djokovic tied Roger Federer and Rafael Nadal by claiming his 20th Grand Slam title Sunday, coming back to beat Matteo Berrettini 6–7 (4), 6–4, 6–4, 6–3 in the Wimbledon final. The No. 1-ranked Djokovic earned a third consecutive championship at the All England Club and sixth overall. He adds that to nine titles at the Australian Open, three at the U.S. Open and two at the French Open to equal his two rivals for the most majors won by a man in tennis history. “I have to pay a great tribute to Rafa and Roger. They are legends. Legends of our sport. They are the two most important players that I ever faced in my career,” said Djokovic, a 34-year-old from Serbia. “They are, I think, the reason that I am where I am today. They’ve helped me realize what I need to do in order to improve, …