STOCKHOLM, June 9, 2012 (AFP) - The world number three opened the tournament with a four-under-par opening round of 68 and produced a stunning round of 64 at the halfway stage to move three shots clear of the field.
Westwood maintained his three-shot cushion on Friday and in the final round could even afford to miss five putts from inside six feet over the first 10 holes of his closing 69.
The 39-year-old Westwood finished on a 19-under-par total of 269, with fellow Englishman Fisher closing with a 71 to finish on 274.
Sergio Garcia's closing 67 was the best round of the day and moved the Spaniard up to a share of third place on 275 alongside Finn Mikko Ilonen and Sweden's Peter Hanson.
It was Westwood's first victory since the Ballantine's Championship in May 2011 and came nearly four months after his runner-up place at the Dubai Desert Classic.
Collated final round scores in the European Tour Nordea Masters at Bro Hoff Slott GC here on Saturday (GBR and IRL unless stated, par 72):
269 Lee Westwood 68 64 68 69
274 Ross Fisher 70 68 65 71
275 Peter Hanson (SWE) 67 68 69 71, Mikko Ilonen (FIN) 70 69 68 68, Sergio Garcia (ESP) 69 69 70 67
276 Joakim Lagergren (SWE) 70 68 69 69
277 Felipe Aguilar (CHI) 69 70 68 70, Jeev Milkha Singh (IND) 73 66 68 70, Richard Sterne (RSA) 69 67 73 68
278 Alexander Noren (SWE) 74 66 66 72, Pelle Edberg (SWE) 69 69 70 70, Ignacio Garrido (ESP) 67 69 73 69, Gregory Havret (FRA) 70 69 68 71
279 Andy Sullivan 68 71 69 71, Darren Fichardt (RSA) 70 70 68 71, Marcus Fraser (AUS) 72 70 65 72
280 Anthony Wall 69 70 70 71, Roope Kakko (FIN) 70 68 72 70, Andrew Marshall 73 70 66 71, Reinier Saxton (NED) 70 70 70 70, Bernd Wiesberger (AUT) 69 71 67 73
281 Richard Bland 67 70 68 76, Chris Wood 71 66 74 70, Jens Dantorp (SWE) 76 67 66 72, Lloyd Saltman 71 64 75 71, Emiliano Grillo (ARG) 68 68 76 69, Daniel Denison 68 70 70 73, Thorbjorn Olesen (DEN) 71 68 69 73, Jamie Donaldson 72 69 68 72
282 Carlos Del Moral (ESP) 68 67 72 75, Peter Whiteford 71 69 69 73, Estanislao Goya (ARG) 70 68 69 75, Kristoffer Broberg (SWE) 71 68 71 72, Scott Strange (AUS) 71 69 72 70, Johan Edfors (SWE) 72 69 69 72, Romain Wattel (FRA) 72 71 70 69, Edoardo Molinari (ITA) 72 69 69 72
283 Magnus A Carlsson (SWE) 65 72 73 73, Michael Jonzon (SWE) 68 68 70 77, Richard Green (AUS) 72 69 68 74, Pablo Martin (ESP) 75 66 70 72