The Argentinian had appeared in four previous finals but had lost each of those, the last of those defeats coming in the Cordoba Open last month.
He went a set and a break up in that showpiece only to lose to Juan Ignacio Londero in three sets, but he kept his nerve to see off Chilean Garin 7-5 6-3 this time around in Sao Paulo.
Pella did not drop a set all week and he will now climb to a career-best 34th in the world rankings when they are released on Monday.
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