Stenson's win took him from ninth to fifth in the rankings, a position he last occupied two years ago.
Elsewhere, two-time major winner John Daly's drastically improved his position from 794th to 451st after finishing joint second in the Italian Open.
The American, who is serving a two‑month ban from the US Tour, closed with a 66 in Turin to finish 11 under, six behind Daniel Vancsik. The Argentine's victory has seen him rise from 420th to 213th in the rankings.