World No. 4 Naomi Osaka announced Thursday on Twitter that she will no longer be working with coach Jermaine Jenkins, who joined her team in late February."I'm super grateful for the time we spent together and the things I learned on and off the court but I feel like now is (an) appropriate time for a change," Osaka wrote.According to Osaka's management agency, she will be coached by her father, Leonard Francois, until she starts looking for a new coach once the season is over.Jenkins, 34, was hired after the Japanese star abruptly parted ways with coach Sascha Bajin just weeks after winnin…READ FULL ARTICLE