I chose the title "the subtle difference", because only small things often decide whether a professional soccer player has a great or just a mediocre career.

我选择了《微妙的区别》作为书名，因为往往是很小的细节决定了一个足球运动员的成败与否。

youdao

Smith is fighting for his maiden professional title in only his eleventh fight in professional ranks, while reigning champion Simpson has mixed in championship class for six years and previously held the British featherweight title.

BBC: Smith wants Simpson's Commonwealth Featherweight title

Months later, he made his professional debut, and in 2010, in only his seventh professional contest, he won a world title.

WSJ: Radio City Fight Night

The former cruiserweight king, who has lost only once in 25 professional bouts, then defended his title by stopping American John Ruiz at the MEN Arena in April.

BBC: WBA champion David Haye to fight Audley Harrison