Tampa Bay Downs' Pick 4 begins at 2:19 p.m. ET on Sunday with Race 5 and goes through Race 8. Before you make any picks, you NEED to know how racing insider and accomplished horseplayer Bob Weir has handicapped the four-race sequence.

Based in Saratoga Springs, N.Y., Weir has been handicapping and following horse racing since reading Andy Beyer's landmark handicapping book "Picking Winners" in the late 1980s. Weir is highly invested in the Beyer Speed Figure, a number assigned to every race run by a horse that measures how fast the horse ran. He uses the figure as the backbone of his handicapping. In fact, thanks to his proficiency with speed figures and top-tier handicapping, he landed one of just eight spots on Beyer's figure-making team in 2017, a position he holds to this day.

Weir's methodology has produced multiple five-figure days. In 2014, he hit a $60,000 Pick 6 at Del Mar. The following year, he nailed a $31,000 Pick 6 at Gulfstream Park. In 2016 and 2017, Weir qualified for the prestigious National Horseplayers Championship in Las Vegas. 

And this year, his first for SportsLine, Weir has been on fire. In January he crushed the Pegasus World Cup, giving out an $8 exacta and a $1 trifecta, winning $757.60. In last month's Sam F. Davis Stakes, he gave out the $.50 superfecta, which paid $150.75. And on Saturday he correctly pegged Wells Bayou to win the Louisiana Derby. Anyone who has followed him this year is way up.

Now, Weir has handicapped the late Pick 4 at Tampa Bay Downs for Sunday, made his picks and formulated his bets.

We can tell you that Weir's top selection in Race 8 is Mighty Electrica, a 4-1 shot in the 12-horse field. Weir will be using five horses in that final leg, but Mighty Electrica is his top one.

In addition, Weir is including a double-digit longshot who he says "could be ready to fire his best race yet." This horse could light up the toteboard and spice up the Pick 4 on Sunday. He's including this horse in his Pick 4 and so should you! You NEED to see Weir's analysis before making any picks of your own.

So which double-digit longshot is Weir using in the Pick 4? And how has Weir constructed his entire grid? ... Join SportsLine now to get late Pick 4 picks for Tampa Bay Downs on Sunday, all from the racing insider who nailed the Pegasus World Cup!