The fourth-seeded Spaniard withstood a fightback from Gil, blowing two match points when leading 5-3 in the second set.
The 120th-ranked Gil took the ensuing tiebreaker and then twice broke Montanes to open a 3-0 lead thanks to some inspired passing shots and fast court speed.
Story continues below ↓advertisement | your ad hereThe Portuguese faded as the set wore on, allowing Montanes to level at 4-4 before dropping serve in the 12th game.
Montanes eliminated No. 1 Roger Federer in two sets in Saturday's semifinals.
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