"He has won two awards in the last three years."

Translation: Ele ganhou dois prêmios nos últimos três anos.

[batallia]

Why "tem ganhado" is wrong?

[Paulenrique]

it is a literal translation, but that would not sound natural in Portuguese.

[Danmoller]

This looks like a present perfect, but it's really different from English. In Portuguese, this is used to express an habit, like "he has been winning (lately)".

Unfortunately, Duolingo let a lot of mistakes pass through the "present perfect" lesson, and that generated discussions like this:
http://www.duolingo.com/comment/451217