single-minded

In 1996, at the age of 17, Scott enrolled at Kooralbyn International School south of Brisbane, a school with a renowned golf program.
His teacher Peter Claughton told Australian media that Scott had been a cut above the other golfing students.
"Adam was switched on and organised. He knew all about golf courses all over the world, the great players, the touring pros and what other amateurs were doing," Claughton said.
"He was single-minded and talked about what he wanted to do. On weekends, he'd plan exactly what he was doing. He wasn't a kid to just hit balls on the practice range. He'd always work on something specific."

http://edition.cnn.com/2013/04/15/sport/golf/scott-masters-golf/index.html?hpt=isp_t5

今回取り上げる表現はsingle-mindedです。見ての通り「一つの目的を持った」、また「ひたむきな、誠実な、一心な」という意味です。（『ジーニアス英和辞典　第４版』大修館）何かを極めるには、目標を決めて予定を立てて、それを実行に移すことが大切だということをこの記事から学びました。オーストラリア勢でマスターズを制したのはアダムスコットが初めてなので、現地ではとても盛り上がっているそうです。(Haramii)