The world number 13 beat Garcia 6-2 6-3 to advance to the next round of the tournament.

Konta is the only British woman to progress beyond the second round of an Olympic singles tournament since tennis was reinstated as a sport in 1988.

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Elsewhere in the competition, compatriot Heather Watson was knocked out by Ukraine's Elina Svitolina in the second round.

Watson went down 3-6 6-1 3-6 to the 15th seed.

It represents a busy day for both Konta and Watson, as they will play in the second round of the women's tennis doubles against Taiwan later on Monday, around 21:00 BST.

Other results in the competition included a 6-2 6-4 win for Czech Republic's Petra Kvitova over Caroline Wozniacki, as well as a 6-4 6-2 victory for world number two Germany's Angelique Kerber over Canada's Eugenie Bouchard.

Seventh seed Madison Keys, of the USA, also progressed to the third round, though only after a nail-biting 7-5 6-7(4) 7-6(5) win against France's Kristina Mladenovic.

Lucie Safarova retired while 2-6 down to Kirsten Flipkens.

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