World No. 2 Daniil Medvedev says Novak Djokovic doesn’t have a problem with congratulating opponents when they win a Grand Slam or achieve some notable milestone. Djokovic, who owns a record seven year-end No. 1 finishes, is in danger of losing the No.1 spot this week. Medvedev, who has been ranked at No. 2 since last year’s March, has a great chance to overtake the Serb at the No. 1 spot this week. Medvedev is playing in Acapulco, where he is the top. Meanwhile, Djokovic is chasing a sixth Dubai title. If Medvedev wins Acapulco, he is guaranteed to become the No. 1 next week. “He’s speaking the truth. Every time I achieved something, and not only me, we can …