In front of a packed grandstand at Southwest Speedway, Laney led all 30 laps in topping the $2,200 to win feature for Xtreme Motor Sports IMCA Modifieds.
A track tour record 90 Modifieds saw action at Dickinson. Marriott had led from start to finish Tuesday at Williston Basin Speedway and challenged Laney in the late going before settling for second at Southwest.
Laney started outside the front row and held off Lucas Schott following a pair of early restarts. Marriott settled into second on lap 11 and tried high and low to get past Laney as the race ended with a long green flag run.
Laney held Marriott in check, gaining a little breathing room before taking the checkers.
Pole starter Dale Mathison ran near the front of the field all night and finished third. Schott and Ricky Thornton Jr. completed the top five.
Two-time and defending champion Elijah Zevenbergen outran 2014 tour king Dalton Flory in the $800 to win IMCA Sunoco Stock Car feature.
Zevenbergen caught Flory for the lead on lap eight and stayed in front the last 17 times around the track.
The final tour date is Thursday, July 14 at Dacotah Speedway in Mandan. Pit gates open at 3 p.m., the grandstand opens and hot laps start at 6 p.m., and racing gets underway at 7 p.m.
Dacotah Speedway also hosts the Friday, July 15 $10,001 Legendary for IMCA Modifieds. Racing starts at 7 p.m.
The Dakota Tour finale and Legendary will both be broadcast by IMCA.TV.com.
Heat winners were Hansen, Mathison, Laney, Schott, Thornton, Marriott, Ruter, Pfeifer, Dahl and Dotson.