As a Vegas bookmaker, Micah Roberts was the first to offer expanded NASCAR betting. Now he hands out NASCAR winners to his followers, and he's already up huge this season.

Those who have wagered $100 on Roberts' winning pick for each of the NASCAR races in 2019 are up $1,300. In fact, those who put down $50 on Roberts' top-four leaderboard picks are up $2,700 on the year, buoyed by Alex Bowman's big win at Chicago at 30-1 odds -- Roberts had the huge underdog in his top four. One of his top four picks has won six of the last 10 races, including Denny Hamlin (12-1) at Bristol, Erik Jones (16-1) at Darlington and Chase Elliott (8-1) at Charlotte Motor Speedway's Roval road course.

Roberts got 2019 off to a blazing start, calling 25-1 longshot Jimmie Johnson's win in the Advance Auto Parts Clash. At the TicketGuardian 500, Roberts nailed Kyle Busch at 4-1 over the heavily favored Kevin Harvick, and at Dover he won with Martin Truex Jr. at 8-1. Truex won despite starting at the back of the field.

Roberts' top 20 leaderboard has been on top of it, too. At the TicketGuardian 500, he nailed an eye-popping eight of the top 10. At the Auto Club 400, he got nine of the top 10 correct.

Roberts entered the 2019 NASCAR season after finishing big-time in the black in 2018. Those who wagered $100 on each of his picks last year saw $1,750 in profit. Anyone who's following his picks is up HUGE year after year. 

Now Roberts has analyzed the field for Sunday's First Data 500. The green flag drops at 3:00 p.m. ET.

We can tell you Roberts is fading Truex, the third choice in the First Data 500 odds, at 6-1. Roberts has Truex ranked 10th on his leaderboard.

"[Truex] struggled at Martinsville for most of his first 18 starts with just two top-fives, but in his last nine starts he's been eighth or better in seven of them," Roberts told SportsLine. "He was third in this race last season."

However, Roberts is high on a double-digit longshot who has great equipment and has been solid with this week's race package. Anyone who backs this driver could hit it BIG.

So who wins the First Data 500? And which massive longshot stuns NASCAR? ... Join SportsLine right now to see the full projected leaderboard for NASCAR at Martinsville, all from the nation's premier NASCAR betting expert who's up HUGE year after year!