Garcia had three birdies on each side in his second round and is at 9-under 135 halfway through the tournament.
First-round leader Ricardo Santos had five birdies and three bogeys Thursday for a 2-under 70 and is tied with Garcia. Also in first are Marcus Fraser and Martin Kaymer, who each had second round scores of 5-under 67.
Five players are tied for fifth at 8-under 136 and another five are at 7-under. A total of 30 golfers are within four strokes of the lead.
Santos lengthened his one-stroke, first-round lead with three birdies in his first four holes Thursday. He slipped back with a bogey at No. 7 and, as he did in the first round, went birdie-bogey-birdie over Nos. 10-12. A bogey 5 at the 15th hole left him tied for first.
Garcia, who had just one bogey Wednesday, had a birdie at the fourth hole Thursday and four more over the span of Nos. 7-12. A birdie at 16 pulled him into the tie for the lead.
Fraser, who started the second round on the back nine, bunched his five birdies over Nos. 1-7. Three of Kaymer's birdies were on par 3s.