Though unable to come anywhere near to producing another day like his first, he still managed to go bogey-free and move to 13-under-par.
``Actually, I played just as well, it was just that fewer putts fell,'' he said. ``I'm still making very few mistakes and I still haven't made a bogey.''
Moving into a tie for second place at 10-under were Australia's Peter Lonard and England's Jamie Spence.
Lonard, just three strokes out of the playoff at the British Open, shot the days best round with a birdie-filled 63, which included five consecutive on holes 11 through 16. An eagle putt on 18 was just wide and the tap in birdie to go seven-under on the day will put the heat on Dier for the weekend.
Spence, who ironically is one of the 10 to shoot a 60 in a European event like Dier did on Thursday, followed up his first round 66 with a wild 64, carding two eagles, four birdies, and two bogeys. He currently ranks 94th on the European money list.
Mark Roe of England is alone in fourth place at 9-under-par, shooting a solid day-2 64 that showed 8 birdies against two bogeys on his scorecard.
An interesting group of three sits six off the pace at 7-under and includes the No. 8 player in the world Padraig Harrington, Ryder Cupper Peter Fulke, and British Open folk hero, Gary Evans.
Harrington had a back-nine 33 with a birdie on the 18th, to get him within striking distance for the weekend. In his fifth trip to the Dutch Open, his 66-67 has him in position to better his tie for ninth last year.
Fulke, who has struggled this year, opened with four birdies on the front and three more on the inward nine to shoot 65.
And then there's Evans. Still riding the emotional wave from Muirfield, Evans eagled the 12th as part of a bogey-less 64 and a tie for fifth. It was his 40-foot bomb to save par last Sunday at the Open and his emotional response to it that has endeared himself to the fans. He finished one shot out of the playoffs.
John Daly still trails by 10 after an up-and-down 67.
Full-field scores for TNT Open