World class horse racing takes place at Saratoga Race Course in Saratoga Springs, N.Y., and on Sunday the late Pick 4 begins with Race 7 at 4:29 p.m. ET and ends with Race 10. Before you make any picks, you NEED to know how racing insider and accomplished horseplayer Bob Weir has handicapped the four-race sequence.

A Saratoga Springs-based racing insider and Beyer Speed Figure maker, Weir is a two-time qualifier for the prestigious National Horseplayers Championship in Las Vegas. He has produced multiple five-figure days at the track over the years, including a $60,000 Pick 6 at Del Mar in 2014. Last year, he was on fire. He hit the exacta in the Sam F. Davis Stakes, Tampa Bay Derby and Peter Pan Stakes, the trifecta in the Risen Star Stakes, Blue Grass Stakes and Pennsylvania Derby and the superfecta in the Belmont Stakes.

This year, he has been red-hot in the Triple Crown prep races, hitting the superfecta in the Blue Grass Stakes, the trifecta in the Louisiana Derby and exactas in the Fountain of Youth Stakes and Tampa Bay Derby. He also has hit the 19-1 winner of the Man o' War Stakes, the trifecta in the Pegasus World Cup, the superfecta in the Met Mile and multiple Pick 4s, including May 14's at Belmont for $1,851. Anyone who has followed him is way up.

Now he has handicapped the late Pick 4 at Saratoga for Sunday, made his picks and constructed his tickets.

We can tell you that Weir is high on Big Invasion, the 1-2 favorite in the Mahony Stakes, the third leg of the Pick 4. "It doesn't take a genius to see that 2 Big Invasion (1-2) has won five straight turf sprints since losing his debut and has improved in each start, winning all five by lengths or more," Weir tells SportsLine. Big Invasion is Weir's top pick in the Mahony and a lone A horse on his Pick 4 tickets.

In addition, Weir is high on a double-digit longshot on Sunday. Weir says this longshot "has tried a lot of different types of races" and could spice up the Pick 4. Weir is including this longshot on his tickets, and so should you. You NEED to see Weir's analysis before making any Pick 4 selections.

So which double-digit longshot can win? And how has Weir constructed his Pick 4 tickets? ... Join SportsLine now to get late Pick 4 selections at Saratoga for Sunday, all from the racing insider who hit the Pick 4 at Belmont on May 14 for $1,851!