keɪdʒjˈʊɹɹoʊ mˈætsuːi pˈɑːpjʊlɚli nˈoʊn æz kˌeɪdʒˈeɪ bˈɔːɹn ɑːktˈoʊbɚ sˈɪkstiːn, nˈaɪntiːnhˈʌndɹɪd ˈeɪɾi fˈaɪv ɪz ɐ dʒˌæpənˈiːz pɹəfˈɛʃənəl bˈæskɪtbˌɔːl plˈeɪɚ fɚðə kæɡˈɑːwə fˈaɪv ˈæɹoʊz ʌvðə bˈiː.lˈiːɡ.
Keijuro Matsui (popularly known as KJ) (born October 16, 1985) is a Japanese professional basketball player for the Kagawa Five Arrows of the B.League.