His son Sam is sharing the 54-hole lead at 12 under par with Frank Nobilo, of New Zealand, and victory will take him to the top of Europe's Order of Merit.
But two shots behind and also chasing the pounds 108,330 first prize is Derrick Cooper, who attributes his new-found form to working last winter with Torrance Snr, one of golf's leading coaches, at Largs on the Ayrshire coast.
Cooper, 40, from Warrington, has played consistently well since wintering in Scotland and, along with the Australian Terry Price, is the nearest challenger to the two joint leaders.
"I usually spend my holidays at home with the family and playing golf with my pals," Cooper said after his third-round 66. "But last year I sought out Bob and we worked on my swing. It seems to have done some good."
Cooper, whose last tournament win was in the 1988 Madrid Open, showed plenty of confidence yesterday despite bogeying the first. He then birdied the next four holes but bogeyed the ninth before picking up further shots at the 13th, 15th and last.
Torrance, who had an eagle three on the 12th, finished well with his third birdie of the day at the last after bunkering his second shot.
But the 41-year-old Scot admitted he had been handicapped by a stomach upset. "I felt queasy all day," said Torrance after his 69.
"But I did well to hang in there and get back to 12 under. The third round is horrific. You can't win a tournament that day, but you can lose it."
Nobilo, winner of the BMW International Open in Munich four weeks ago, eagled the last after birdieing the 17th. Colin Montgomerie, Europe's No 1 for the last two years, is in a group of four on nine under after a 67. Richard Boxall, David Williams and the American Scott Hoch are also on the same mark.
But John Daly, the Open champion, looks out of contention after a two- over-par 73, though he promised: "I'm going to use the driver a lot more and have some fun in the last round. I'm going to be aggressive."Reuse content