Japan: M15 Yanagawa 2 - Singles - Main
1/8-finals Katayama S. Hara Friend J. D. 0:2 (3:6, 5:7) details 28.12.2023
1/16-finals Shiraishi H. Katayama S. 0:1 RET. (3:6, 0:2) details 27.12.2023
Japan: Matsuyama - Singles - Main
1/16-finals Katayama S. Blancaneaux G. 0:2 (0:6, 4:6) details 07.11.2023
Japan: Matsuyama - Singles - Main
1/16-finals Hsu Y. H. Katayama S. 2:0 (7:5, 6:4) details 08.11.2022
Japan: Toyota - Singles - Main
Quarter-finals Katayama S. Kravchuk K. 0:2 (2:6, 64 :7) details 27.11.2015
1/8-finals Jones G. Katayama S. 0:2 (5:7, 65 :7) details 25.11.2015
1/16-finals Van Peperzeel G. Katayama S. 0:2 (4:6, 2:6) details 23.11.2015
Japan: Kobe - Singles - Main
1/16-finals Lee D. H. Katayama S. 2:0 (6:3, 6:1) details 09.11.2015
Japan: Toyota - Singles - Main
1/8-finals Duckworth J. Katayama S. 2:0 (6:3, 6:2) details 20.11.2014
1/16-finals Huang L. C. Katayama S. 0:2 (3:6, 4:6) details 18.11.2014
USA: Costa Mesa 2 - Singles - Main
1/16-finals Dome A. Katayama S. 2:1 (3:6, 6:4, 6:1) details 18.09.2013
USA: Claremont - Singles - Main
Quarter-finals Katayama S. Abid H. 0:2 (2:6, 1:6) details 13.09.2013
1/8-finals Katayama S. Siwy R. 2:0 (6:3, 6:4) details 12.09.2013
1/16-finals Katayama S. Bazrganian S. 2:0 (6:4, 6:2) details 10.09.2013
Japan: Tokyo-Akishima - Singles - Main
Semi-finals Katayama S. Saito T. 1:2 (6:4, 3:6, 4:6) details 22.06.2013
Quarter-finals Takeshima S. Katayama S. 0:2 (2:6, 4:6) details 21.06.2013
1/8-finals Watanuki Y. Katayama S. 0:2 (2:6, 2:6) details 20.06.2013
1/16-finals Leeder A. Katayama S. 0:2 (2:6, 1:6) details 18.06.2013
Japan: Karuizawa - Singles - Main
Quarter-finals Kibi Y. Katayama S. 2:1 (2:6, 7:5, 6:4) details 14.06.2013
Japan: M15 Kashiwa - Doubles - Main
1/8-finals Ito T./Katayama S. Kawachi K./Tokuda R. 1:2 (3:6, 7:5, 6:10) details 02.04.2024
Japan: M15 Yanagawa 2 - Doubles - Main
Final Katayama S./Nakagawa S. Kawachi K./Sueoka Y. 2:0 (6:2, 6:3) details 30.12.2023
Semi-finals Ichikawa T./Kono Y. Katayama S./Nakagawa S. 0:2 (63 :7, 2:6) details 29.12.2023
Quarter-finals Saitoh K./Yamanaka T. Katayama S./Nakagawa S. 0:2 (1:6, 1:6) details 28.12.2023
1/8-finals Katayama S./Nakagawa S. Liu S./Zhang C. 2:0 (6:0, 6:3) details 26.12.2023
Japan: M15 Yanagawa - Doubles - Main
Quarter-finals Isomura K./Sueoka Y. Katayama S./Watanabe S. 2:1 (2:6, 7:5, 14:12) details 23.12.2023
1/8-finals Noguchi M./Yoshimura D. Katayama S./Watanabe S. 0:2 (1:6, 4:6) details 23.12.2023
Japan: Matsuyama - Doubles - Main
1/8-finals Katayama S./Takeru Y. Ho R./Romios M. C. 0:2 (5:7, 3:6) details 08.11.2023
Japan: M25 Sapporo - Doubles - Main
Final Katayama S./Takeru Y. Huang C. C./Kikuchi Y. 2:0 (6:4, 6:4) details 09.09.2023
Semi-finals Matsumura R./Ogura K. Katayama S./Takeru Y. 0:2 (2:6, 0:6) details 08.09.2023
Quarter-finals Katayama S./Takeru Y. Isomura K./Sueoka Y. 2:1 (6:4, 2:6, 10:6) details 07.09.2023
1/8-finals Katayama S./Takeru Y. Matsuda K./Taguchi R. 2:0 (6:1, 6:4) details 06.09.2023
Japan: M15 Karuizawa - Doubles - Main
1/8-finals Katayama S./Okamura I. Han Seon Yong/Shin S. 0:2 (2:6, 4:6) details 01.06.2023
Japan: M25 Kashiwa - Doubles - Main
Semi-finals Hsu Y. H./Huang T. Katayama S./Takeru Y. 2:0 (7:5, 6:4) details 07.04.2023
Quarter-finals Katayama S./Takeru Y. Hazawa S./Shimizu Y. 2:0 (6:0, 6:3) details 06.04.2023
1/8-finals Kawachi K./Lee J. M. Katayama S./Takeru Y. 1:2 (7:5, 3:6, 4:10) details 04.04.2023
Japan: Matsuyama - Doubles - Main
Semi-finals Katayama S./Takeru Y. Harris A./Smith J. P. 0:2 (4:6, 4:6) details 11.11.2022
Quarter-finals Mochizuki S./Noguchi R. Katayama S./Takeru Y. WO. details 10.11.2022
1/8-finals Chung Y./Shimizu Y. Katayama S./Takeru Y. 0:2 (4:6, 2:6) details 09.11.2022
Japan: Toyota - Doubles - Main
1/8-finals Katayama S./Onozawa A. Kwon S./Lim Y-K. 1:2 (6:4, 2:6, 5:10) details 14.11.2016
Japan: Kyoto - Doubles - Main
Quarter-finals Bega A./Janvier M. Ehara H./Katayama S. 2:1 (5:7, 6:2, 10:7) details 25.02.2016
1/8-finals Ehara H./Katayama S. Bai Y./Chen T. 2:1 (6:4, 2:6, 10:8) details 24.02.2016
Japan: Toyota - Doubles - Main
1/8-finals Klein B./Reid M. Katayama S./Kondo H. 2:1 (5:7, 6:3, 10:6) details 23.11.2015
Japan: Kyoto - Doubles - Main
Semi-finals Mitchell B./Thompson J. Katayama S./Sato B. 2:0 (6:3, 6:1) details 27.02.2015
Quarter-finals Katayama S./Sato B. Kondo H./Suzuki T. WO. details 25.02.2015
1/8-finals Li Z./Venus M. Katayama S./Sato B. 0:2 (4:6, 3:6) details 24.02.2015
Japan: Toyota - Doubles - Main
Quarter-finals Katayama S./Sato B. Buchanan C./Rola B. 0:2 (5:7, 2:6) details 21.11.2013
1/8-finals Sekiguchi S./Ward A. Katayama S./Sato B. 0:2 (5:7, 3:6) details 18.11.2013
1/8-finals Herbert P./Moser F. Katayama S./Sato B. CAN. details 18.11.2013