i think the OP meant older not younger in this phrase - "10 years younger than his opponent".
we will see how far pacquiao is prepared for this yet another fight of his career. he has nothing to prove anymore. he is already a legend in boxing. what is there to gain for this fight anyway? more money? proof that he can still fight at his age? in any case, still interesting to watch this coming july...
Even if he younger than on his opponent Pacquiao was a great boxer all over the world. This coming fight we will see if who will win in their fight. We see it already in the past fight of Pacquiao that he has already many proven for the boxing.