Lewis lost 3–1 to Daryl Gurney in the first round of the 2016 World Championship. In the second UK Open Qualifier, Lewis reached the semi-finals and was narrowly beaten 6–5 by Alan Norris. This gave him entry in to the third round of the main event and Stephen Bunting hit legs of 12 and 11 darts to move from 8–7 down to win 9–8. In the penultimate Players Championship event, Lewis eliminated the likes of Benito van de Pas and Robert Thornton to play in the quarter-finals, where he lost 6–5 to Simon Whitlock. He recorded a 6–4 win over Jamie Caven in the opening round of the Players Championship Finals, before being knocked out 6–4 by Dave Chisnall.