Kei Nishikori won the second match as Japan took a 2-0 lead over Colombia on Day 1 of their best-of-five Davis Cup tennis World Group I tie Saturday. The former world No. 4 defeated Nicolas Mejia 6-4, 6-4 after Yoshihito Nishioka’s opening 6-2, 6-4 victory over Adria Soriano Barrera on a hot day at Ariake Colosseum in Tokyo. Nishikori, currently ranked 205th, got one break in each set while holding all of his service games. The opening game of the first set went to deuce eight times before Mejia managed to hold serve. “It was my first match in Japan in a while, so I was a bit nervous,” said th…