Here are a couple of errors on Yahoo! Sports that are relatively rare. So unusual, in fact, that I think the writer may be a student of English as a Second Language:
How often have you seen amount used when number is so obviously called-for? Uh, never. At the risk of boring all the literate Terribly Write readers, let me summarize: Use amount of with uncountable nouns; it is often used with singular mass nouns such as an amount of money, an amount of love, an amount of time. Number of is used with countable nouns, which are usually plural, like number of errors, number of students, number of leagues.
And since we’re talking about leagues, we might want to consider why the writer thought that they should be referred to by the pronoun who, which should be used exclusively for human beings. (The writer should have chosen that instead of who.) Maybe the writer thought leagues are people, too.