The Englishman was one over par after his opening round of 72 on Thursday and sat nine shots behind first round leader Lucas Herbert, but rounds of 63 and 61 meant he was just two behind the Australian heading into the final round in Vilamoura.


On Sunday it all came down to a three-way battle between Lewis, Herbert and England's Eddie Pepperell, with Lewis ultimately signing for a 66 to get to 22 under par and finish three shots clear of his two rivals.


Lewis won this event in 2011 in just his third start as a professional and arrived this week in fine form, having won the Bridgestone Challenge on the Challenge Tour two weeks ago.


The last two holes proved pivotal as Lewis found the water off the tee on the 17th and had to hole a stunning 35-foot putt to save par, as a Pepperell bogey on the last made it a two-horse race.


Herbert then found water off the final tee on the way to a closing double-bogey to finish tied second alongside Pepperell at 19 under par and three shots behind Lewis.


South Korea's Soomin Lee finished with a 64 to get to 17 under par alongside Swede Marcus Kinhult, one clear of 2012 Portugal Masters champion Shane Lowry of Ireland.


Sergio Garcia warmed up for The Ryder Cup with a closing 65 to finish at 15 under par with local favourite Ricardo Gouveia, Frenchman Raphaël Jacquelin, Finn Kim Koivu and England's Oliver Fisher - who will never forget his week after carding the European Tour's first 59 on Friday.