It was a competitive fight all the way with both fighters landing their share of solid shots.
In the third round saw Diaz rock Dogboe with a left hook, but the Ghanaian recovered quickly.
Dogboe looked to box more and pick his spots to punch, which he did in the sixth and seventh rounds when he caught Diaz with a combination along the ropes.
Both fighters gave it all in the last round as though both believed the outcome was in doubt and close.
Dogboe, a former junior featherweight world titlist, won the entertaining bout 96-94 and 97-93 while one judge scored the fight 95-95.
This win means Dogboe has won his third fight in a row since losing his WBO to Navarette in December 2018.
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