Lewis took control of the event with his second-round 66 and after supplementing it with another six-under-par round on Sunday, he took a two-shot lead into the final round.
While doubtless focused on winning the tournament, the two-time Portugal Masters champion also knew that a top-five finish would guaranteed him a PGA Tour card, in the end securing both with the minimum of fuss.
After a dropped shot from Fabian Gomez, his nearest pursuer, Lewis took apart the par-five 15th to make birdie and move five clear, and then almost holed his approach to the 16th green as he ultimately completed a five-stroke victory.
Securing a PGA Tour card presents a conundrum for the 28-year-old, who may now be tempted to remain in the US for the start of the new season in less than a fortnight and forego opportunities on the European Tour.
Lewis would have been expected to defend his title in Portugal in October, an event which clashes with the Houston Open, while he's got form in the Dunhill Links which collides with the Safeway Open.
These are good problems for any European golfer to have - though there would have to be some concern on the part of the European Tour as they potentially lose a top-100 player, one who may well be on the radar for next year's Ryder Cup.
For now Lewis can celebrate the fourth professional victory of a career which had looked to be faltering until he won the Bridgestone Challenge on the Challenge Tour almost exactly a year ago, which in turn provided the springboard for a second victory in Portugal.
As ever, the Korn Ferry Finals provided high drama, with American youngster Doug Ghim boisterously celebrating a par save on the final hole of the tournament which was do-or-die in terms of earning his first ever PGA Tour card.
Ghim holed from eight feet to survive before Richy Werenski found the par he needed at the same hole, with DJ Trahan scraping inside the top 25 with a clutch birdie.
Chris Baker, playing in his home state of Indiana, also overcame obvious nerves to par the final hole and earn a PGA Tour card having seemingly been in cruise control until a double-bogey at the 17th, but there was heartbreak for South Africa's Justin Harding who came up an eighth of a point short.
Harding would have earned a card had Lanto Griffin holed a five-foot putt at the final hole, but when that lipped out Harding was denied by the narrowest of margins having been in a strong position before missing the cut in the final event.
