1
favorito (previsible vencedor)
1
favorite (to win);favourite;likely winner
本命と対抗馬が競り合ったお陰で、ダークホースの彼が漁夫の利を得たってわけだ。
Since the favorite and his rival were running against each other a dark horse like him was able to pull out in front.
2
one's heart's desire;first choice