Golf-Perez wins by two shots in Mexico (Reuters)

* Perez wins in only third event back from injury

* Says aggressive approach was key

* Third-round leader Woodland finishes second (Adds detail, quotes)

Nov 13 (Reuters) - American Pat Perez, benefiting from a greatly improved mental approach to the game, ended a seven-year title drought on the PGA Tour with a two-shot victory in the OHL Classic at Mayakoba in Mexico on Sunday.

In only his third tournament back since being sidelined for eight months by a shoulder injury, the long-haired Perez used a fast start and clutch finish to seal his second win on the U.S. circuit with a closing four-under-par 67.

Though he made his only bogey of the day at the par-four 12th after hitting a wayward tee…