In 2015, Lawrence returned for a third season with Miller Racing in TA2 where he took four more victories and led the championship heading into the final round at Daytona International Speedway where he, after starting 26th due to a red flag during qualifying, passed 15 cars in the opening three laps before he was forced to pit with mechanical issues, effectively costing him a third-straight championship.

At the 2015 24 Hours of Daytona, Lawrence took the GTD class win on his first attempt alongside teammates Al Carter, Dominik Farnbacher, Ben Keating, and Kuno Wittmer.

Lawrence ran as high as fourth overall before electrical issues forced the team to take an extended pitstop which put the car well outside the top ten.

Lawrence returned to IMSA WeatherTech SportsCar Championship for Petit Le Mans where he competed with Turner Motorsports in the No.

[9] Lawrence returned to Turner Motorsports for the Rolex 24 Hours of Daytona with co-drivers Don Yount, Mark Kvamme, Jens Klingmann and Martin Tomczyk.

[10] In 2021, Lawrence joined Reaume Brothers Racing for his NASCAR Camping World Truck Series debut at Circuit of the Americas.