Justin Rose picked up five shots over the previous eight holes to propel herself into contention following the opening round of the Italian Open in Rome.
Rose was level par for the day and seven off the lead before he reeled off four birdies in five holes from the 11th and added a second at 17 as he fired an exceptional five-under 66 on the championships return to Olgiata Golf Club for the first time since 2002.
Tapio Pulkkanen will sleep on the outright lead with Rory Sabbatini appearing among a group of five players in a share of third place as his closest challenger, together with Rose, following his bogey-free 64. But home preferred Francesco Molinari has a ground to make up after he returned a 71.
Pulkkanen, winner of the Challenge Tour Order of Merit in 2017, began in the 10th and, even following a first birdie at 11, he left four in a row from the 14th until he accompanied a continuous series of pars with two more gains in six and five.
The 29-year-old Finn parred home to stay at seven under, a score which held up during the rest of the afternoon, although Sabbatini failed to catch a share of the lead until he got into trouble in the eighth - his 17th - and - abandoned his 25-foot par putt brief.
Even the South African-born Slovakian did bounce back with a birdie at the long ninth to cap a 65 for second, while Rose had been the headline act at the logjam on five under, which also contains Bernd Wiesberger and Joost Luiten.
Rose made a positive start when he fell a 20-footer for birdie at the first, until he restored his around with a welcome birdie at the 42, but bogeys at the fifth and third left him eight shots off the pace.
The world No 5, whose eighth position at the BMW PGA Championship is the only top-10 finish since the US Open in June, then obtained his putter to warm up on the back nine along with his streak of five birdies in seven holes gave him lots of effort to take into the second day.
Of course a wonderful birdie on No 1 and that I always felt great about things, explained Rose. But then I played five or four really poor holes where I was missing fairways, overlooking greens, really having to grind to actually be one over through six.
I then made a great birdie at seven, and that I sort of reset my goals. I sort of broke my round down and my goal was to attempt to become one under for each of these sets of holes to try and get it in your house.
I had a nice hot run on the back nine and got to much more of a flow, and I putted unbelievably. I browse the greens and hit my traces. The greens seemed like they had been becoming tough but still holding their lineup really well, which is very good on the market. I hit enough good excellent shots coming and capitalised with the putter.
The AndrewBeef Johnstons circular followed a similar pattern to Roses as he birdied his original - that the 10th - before bogeys at 15 and 16 left him on the card until he left a four at the 17th.
Johnston then enjoyed an front two and a birdie-birdie finish completed a 67 that was matched by Matt Fitzpatrick, additionally also birdied eight and eight at an inviting response to some double-bogey six in the fifth.
Wentworth winner Danny Willett continued his good form as he maintained a bogey off his cardalthough hed leave a few birdie chances on the path from his 68, while former US Open winner Graeme McDowells 69 was great enough to be tied to 20th with Matt Wallace and climbing Scottish star Bob MacIntyre.
Molinaris bid for a third triumph on home soil, 13 years after his initial, got off to a disappointing start as he bogeyed two of his first five holes, although he did pick up his first birdie of the championship in the long 17th before having to settle for a run of nine successive pars.
But the 2018 Open winner gave his fans a lift at the ninth when he holed in the fringe whilst playing-partner and present holder of the Claret Jug was one adrift, to salvage a 71.
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