But his last act before joining the pro circuit will be competing in amateur golf's version of the Ryder Cup in Aberdeen.
"I'm not focusing on turning pro, the focus is on this weekend," Lewis told BBC Sport.
The biennial competition, which pits Great Britain & Ireland against the United States, will be played on the Balgownie Links of the Royal Aberdeen Golf Club, which was founded in 1780, making it the sixth oldest in the world.
The course's signature hole is the par-three eighth which, at 148 yards, is not particularly long but it has nine bunkers surrounding the green and dependant on the direction of the wind, could be a three iron one day, a pitching wedge the next.
Lewis has earmarked five other holes as being vitally important to Great Britain & Ireland team though.
"The first two and the last three are important," he stated. "That's where the competition will be won and lost.
"If we do well on those holes we will be in with a good chance of winning."
Steven Brown, 24 (Wentworth); James Byrne, 22 (Banchory); Paul Cutler, 22 (Portstewart); Alan Dunbar, 21 (Rathmore); Stiggy Hodgson, 21 (Sunningdale), Tom Lewis, 20 (Welwyn Garden City); Rhys Pugh, 17 (Glamorgan); Jack Senior, 23 (Heysham); Michael Stewart, 21 (Troon Welbeck); Andy Sullivan, 24 (Nuneaton)
"The Americans have some strong players, some of whom have played in the majors as well" he continued, "but we're on home turf with our crowd and weather they are not used to.
"I'm looking forward to playing and if we play our best in these conditions we can win."
George Herbert Walker, who lends his name to the trophy, was president of the United States Golf Association when the first unofficial match was contested in 1921 on the eve of the Amateur Chamionship at Hoylake.
The now legendary Bobby Jones helped the Americans win 9-3.
Great Britain & Ireland won the event for the first time in 1938 at St Andrews but, as with the Ryder Cup, the US dominated for the next 50 years.
A solitary victory at St Andrews in 1971 was their only triumph and they had to wait until 1989 for their next, which was also the first win on American soil.
The Americans have won the last three Walker Cups, but the Great Britain & Ireland team were victorious in the preceding three.
Rory McIlroy, then 18, played the last time the Walker Cup was held on British shores, at Royal County Down Golf Club in 2007.
That Great Britain & Ireland team was beaten
by a United States line-up featuring Rickie Fowler, Dustin Johnson and Webb Simpson, who won the
Deutsche Bank Championship
Last time out, the US thrashed GB & Ireland
at the Merion Golf Club in Pennsylvania in 2009 with a team again featuring Fowler.
UNITED STATES TEAM
Blayne Barber, 21 (Lake City, Florida); Patrick Cantlay, 19 (Los Alamitos, California); Harris English, 22 (Thomasville, Georgia); Russell Henley, 22 (Macon, Georgia); Kelly Kraft, 22 (Dallas, Texa); Patrick Rodgers, 18 (Avon, Indiana); Nathan Smith, 33 (Pittsburgh, Pennsylvania); Jordon Spieth, 18 (Dallas, Texas); Peter Uihlein, 21 (Orlando, Florida), Chris Williams, 20 (Moscow, Idaho)
But the members of this year's teams will be hoping to emulate some of the great names who have played in this tournament in the past.
The 1999 GB & Ireland team, which triumphed at Nairn, included Luke Donald, Paul Casey, Simon Dyson and Graeme Storm.
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