Taylor, Barney into play-offs
Author: Sky Sports Darts
It means both men move to 19 points in the standings and join Michael van Gerwen in the semi-finals at London's O2 Arena on May 16.
Having lost to Thornton in Brighton earlier in the campaign, Taylor was out for revenge against the Scot and made a superb start with checkouts of 78 and then a spectacular 164 helping him into a commanding 4-0 lead.
Thornton then began to find his form and got on the board with a fine 138 finish of his own with his opponent waiting on 60, but Taylor responded with a 97 checkout to restore his four-leg cushion.
Thornton would take the next, but Taylor remained in control and finishes of 76 and 68 closed out a resounding triumph for the 15-time world champion.
"Robert Thornton has been one of the best players this year and to beat him is a massive bonus," Taylor told Sky Sports afterwards. "He's a cracking player and full of confidence. Even when you're beating him, he's like a boxer who doesn't stay down when you knock him out, he just keeps getting up again."
On the possibility of a final showdown with van Gerwen, Taylor added: "It's on the cards. I think it's the final everybody would like to see and I would love to meet Michael in the final just like I did in the world championship. I'd love to play him, that's who's inspiring me at the moment."
Van Barneveld could yet have a big say on who makes the final as he maintained his excellent form with a solid win over a lively Lewis.
'Jackpot' paid the price for something of a meltdown in leg six as he missed six darts at a double allowing his opponent to break and pull into a 4-2 lead.
Lewis did break back in leg nine as he found double-10 to make the score 5-4, but that would be as close as he got with Barney taking out 80 in three darts in the next to re-establish control.
The Dutchman wrapped things up by taking out 74 and could yet finish top of the standings if he wins his remaining two matches.