Shinjō Mikiyasu was a Japanese pro golfer who won the Arizona Phoenix Open over Greg Norman a year and seven months prior to the beginning of the story. His career came to an end after a car accident, which left him unable to swing a golf club. He envies Dandoh because he has good friends that back him up, thus agrees to teach Dandoh, Yuka, and Kōhei after they show him their determination and patience.

(Source: Wikipedia)

Dandoh was playing a baseball game with friends Yuka and Kohei and hits a wild fly ball which crashes into the principal's potted plants. Rather than getting mad, the principal admires Dandoh's swing and introduces him to the world of golf. It's now an adventure in golf as Dandoh is under the watchful eye of a former pro-golfer. They enter a tournament together and play for a shot at the national championships.
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(Source: Anime News Network)

Shinjo Mikiyasu