At 19-under-par, Campbell is one clear of the Argentine, and four shots lower than his next nearest competitors, Colin Montgomerie and overnight co-leader Padraig Harrington, who shot a third-round 69.
Campbell is trying to finish what he started in 2000. The Kiwi began the season with consecutive wins at the Johnnie Walker Classic and Heineken Classic. He held the early lead on the Order of Merit; and a win this week would once again put him back in the money race.
'I've gone out and played and had fun,' said Campbell. 'It's been like when you go out and play with three buddies. You usually go out and score well.
'The most important thing I do is keep in the present time. If I think too far ahead, that's when I go wrong. I will take each hole as it comes tomorrow and see what happens.'
About his final-round partner, Campbell said: 'Jose is a strong player - a real little grinder. He's very much in contention, as are the guys three or four shots behind. This is a golf course where, if you get going, you can make birdies and eagles out there.'
Coceres certainly got it going on Saturday. The winner of this year's Dubai Desert Classic came home in 30 for a 7-under-par 65.
'It all points to an exciting finish tomorrow, but it's not just about the two of us,' said Coceres. 'Guys like Langer, Montgomerie and Harrington are all very good players and they can be dangerous.'
In search of his eighth-straight money title, Montgomerie carded a third-round 66, but failed to make a move. In fact, thanks to Campbell's 65, the Scot lost ground on Saturday.
'I'm not happy with a 66, not at all,' said Monty. 'I missed a couple of short putts coming in at 17 and 18 which both went the wrong way. I've got my game back in shape, so it's disappointing to shoot 66. That seems to be around par today.
'I felt two 66s (over the weekend) would be good enough, but now I need something silly like 62 to win. It's on if there is no wind and conditions remain the same.'
There are ten players within six shots of the lead. Thomas Bjorn is five back at 14-under. Langer is one shot higher at 13-under. The three-time German Masters champion is in a five-way tie for 6th with Miguel Angel Jimenez, Sam Torrance, Ignacio Garrido and Adam Scott.