The previous four years had seen the victor score at least 17 under at Eichenried, and Romero catapulted himself into a tie for the lead with six birdies in eight holes.
Both men will be looking over their shoulder at two big names on moving day, with Masters victor Garcia and Open champion Stenson among a group of five players tied for second at eight under.
And after hitting his third shot out of shallow water at the 11th, the 44-year-old rolled in his 20-foot birdie putt to get to 11 under.
He holed out from the fairway on the 13th, but Garcia hit a fine approach into the 15th and a better tee shot into the 17th to move alongside him.
Garcia is making his first appearance in Europe since his maiden Major triumph at the Masters in April while Stenson is seeking to defend the title he won by three shots in Cologne last season.
Garcia said: "It's nice but it doesn't mean that it's finished".More news: Prince Philip Released From Hospital
The Swede is level atop the leaderboard with France's Stalter, who posted a four-under 68. "So I've just got to go out there tomorrow with the same attitude and if I can keep hitting some good shots, then hopefully I've got a say come (Sunday) afternoon".
"We kept it pretty tidy, anyway, and made a couple of birdies when we had the chances and didn't drop too many".
"I think I obviously have a little more confidence since the Masters but I don't think I'm a better player than I was before I won the green jacket".
First round leader Wade Ormsby slipped further from contention when he could only produce a round of 73 today and is now in a share of 28th place while Richard Green is 66th.
The overnight leaders started slowly, with Bland playing his first eight holes in one over, while Spaniard Garcia was even par.
Rikard Karlberg (66) was fifth at 14 under, a stroke ahead of Tommy Fleetwood, who finished with an eagle for a 67, and Renato Paratore (68). So I'm happy with that. "I've not been playing that great".