Toru Taniguchi has been hospitalized due to a mystery illness that forced him to cancel his plan to appear in three U.S. PGA Tour events, his manager Naohisa Oshita said Thursday.

Taniguchi left Japan on Feb. 4 and was preparing for this week's Buick Invitational in California, which would have been his first tournament of the year, when he complained of fatigue and returned to Japan on Tuesday.

No details on the nature of the illness were disclosed.

Last December, Taniguchi was named the Player of the Year after finishing on top of the 2002 money list for the first time with 145.4 million yen in official earnings and four victories. He qualified for the Masters Tournament in April along with three other Japanese golfers.