The Bleeding Love singer has sold a total of 3.9 million albums and a further 4.4 million singles in the UK since winning the show back in 2006.
The figures were released by Music Week in the run up to the show’s tenth anniversary. To date, artists from the singing contest have sold 30 million singles and 18 million albums here since the show began in 2004.
Murs is one behind Lewis in the singles with 3.9m in sales, while JLS trail behind in third with 3.4m. The positions are reversed however when looking at album sales.
JLS came out on top out of the two with units of 2.7m, beating Murs who sits back in third with 2.6m.
Elsewhere, Alexandra Burke holds the title for the best-selling X Factor single with Hallelujah shifting over 1.2m copies. The single beat James Arthur’s Impossible by 30,000 sales.
Check out the Top 10 X Factor acts in terms of UK singles and album sales below!