Jimenez posted a very steady 2-under-par 68 in the third round while Campbell, the second-round leader, was 1-under for the day. That left them tied at 10-under 200 after 54 holes.
Matteo Manassero jumped from 10th into a tie for third with a 64 that included a four-hole run in which he had an eagle and three birdies. Zhang Lian-wei, who shot 69 Saturday, is tied with Manassero for third at 9-under.
Fredrik Andersson Hed fought through three bogeys en route to an even-par 70 and is in fifth place at 8-under.
Jimenez on Saturday completed his second consecutive bogey-free round. His birdies came at No. 10 and the 529-yard, par-5 13th, which he has birdied each of the three days.
Campbell, looking for his first title in seven years, opened with a birdie. He had bogeys at Nos. 6 and 11 but both times answered on the next hole with birdies. Campbell dropped a 10-foot par putt on the 18th hole to keep the tie with Jimenez.