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 28 NASCAR races in 2019 are up $2,000! In fact, those who put down $50 on Roberts' top-four leaderboard picks are up $2,450 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. He's been paid on four of the last five races, including Denny Hamlin at 12-1 odds at Bristol and Erik Jones at Darlington at 16-1.

Roberts for 2019 off to a blazing start with Jimmie Johnson as a hefty 25-1 long shot at the Advance Auto Parts Clash. The result: Johnson survived a huge crash and went on to win the rain-shortened race as Roberts' followers raked it in. 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 the race 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 have $1,750 in profit to show for it. His biggest wins came when he went against the grain, taking Brad Keselowski at 12-1 to win the South Point 400 at Las Vegas in the opening race of the NASCAR playoffs and going with Joey Logano, also 12-1, to take the First Data 500 at Martinsville. He also nailed four of Harvick's nine series victories and three of Busch's nine wins. Anyone who's following his picks is up HUGE year after year. 

Now Roberts has analyzed the field for Sunday's Big Machine Vodka 400 at the Brickyard at Indianapolis Motor Speedway. The green flag for the final race of the regular season drops at 2 p.m. ET.

We can tell you that Roberts is fading Truex, one of the top contenders at 8-1 NASCAR at Indianapolis odds. Truex has struggled at Indy in 14 career starts. That includes taking 40th last year and 33rd in 2017. Roberts doesn't see a massive reversal of fortune on Sunday -- he has Truex finishing outside his top 10.

"Indy has been a place where he's had some awful luck resulting in a 20.9 average finish between 14 starts," Roberts told SportsLine. "His fourth-place in 2015 is his only top-five."

However, Roberts is eying a dark horse with double-digit odds who has run well at this track and has raced strong using the car package in play. He's trending upward and Roberts says Sunday could be his day. Anyone who backs this driver could hit it BIG.

So who wins the Big Machine Vodka 400? And which driver stuns NASCAR? ... Join SportsLine right now to see the full projected leaderboard for the Big Machine Vodka 400, all from the nation's premier NASCAR betting expert who's up HUGE year after year!