At the World Grand Prix, Thornton did not drop a set in the first two rounds in wins over Daryl Gurney and Justin Pipe. Thornton then beat Ian White and Mensur Suljović en route to the final. He faced Michael van Gerwen, who hit eighteen 180's, but Thornton beat him 5–4 in sets to win his second PDC major title and third overall. Thornton also rose to number five in the PDC Order of Merit and secured his entry into the Grand Slam of Darts, where he lost 16–7 in the quarter-finals to Phil Taylor.