Despite missing out on the ATP Comeback Player of the Year Award, ninth-ranked Kei Nishikori said he is happy with the way his season unfolded, especially after he became one of eight players to qualify for the year-end finals.Nishikori will face former world No. 1 Roger Federer Sunday at London's O2 Arena, a challenge that comes at the end of a long road that included finishing a five-month wrist injury layoff in January and then starting his 2018 campaign on the second-tier Challenger circuit."I'm really happy. It's not easy to come here. I'm going to compete thinking I've been given a bo…READ FULL ARTICLE