Dale Earnhardt Jr. believes Sam Mayer's criticism of the O'Reilly Series field could come back to haunt him on track After Mayer claimed nobody in the series was worth anything past 10th place, Dale argued that he risked turning the entire field against him rather than just the driver he was upset with. With Mayer joining JR Motorsports next season, TJ Majors and Dale even joked about getting him media training before he arrives #NASCAR #SamMayer #OReillySeries #JRMotorsports #DaleJr