Kenji Hosoishi and Taiwan's Chen Ching-Po had birdie putts on the last hole to take the solo lead but missed.

Katsumata entered a five-way playoff with Hosoishi, Chen, Taiwan's Hsieh Yung-yo, and countryman Koichi Ono.

"[4] Katsumata, Hosoishi, and Ono outlasted the Taiwanese players on the first two playoff holes.

Katsumata opened with a three-under-par 69 to take one-stroke lead over Al Balding and Haruyoshi Kobari.

Katsumata opened with even-par rounds of 72 to put him in a tie for fourth place with Doug Sanders, four back of leader Bob Charles.

[14] So far Katsumata had outplayed a number of notable players including Peter Thomson, Gene Littler, and Mike Souchak.

[16] Despite the higher score he moved into a tie for third place with Sanders and Thomson, though now six strokes behind leader Charles.

[17][18] In the final round, however, leader Charles played poorly opening doors to the field.

He moved into a tie for third place, one back of leaders Ralph Moffitt and Brian Huggett.

[24] Later in the year, in August, he was chosen as an alternate for Japan's 1964 Canada Cup team.

The event was held at Royal Selangor Golf Club in Kuala Lumpur, Malaysia.

In the final round he shot a 70 (−2) to move into a tie for fifth place with countryman Kenji Hosoishi, seven back of champion Harold Henning.

He opened with a 71 (−1) to put him in a tie for fourth place, three back of leader Hsu Chi-san.

[34] In late March, Katsumata began play at the Hong Kong Open.

[35] According to The Straits Times, it was a surprise that Katsumata was in the lead as he was considered "a virtual unknown."

"[3] In late February 1971, he played the Philippine Open, the first leg of the 1971 Asia Golf Circuit.

In 1993, he completed his design of Sawang Resort & Golf Club near Bangkok, Thailand.