Horse racing betting is reaching the final stages of Kentucky Derby prep races, and one of the biggest events is this weekend. The Santa Anita Derby is headlined by a number of horses atop the Derby futures and will go a long way into shaping the final odds for the Run for the Roses on May 5.

Here’s a look at the top horse racing bets contenders expected to be among the field for the Santa Anita Derby on April 7.

Bolt d’Oro
This was supposed to be another showdown between the top two Kentucky Derby contenders, but McKinzie was pulled from the Santa Anita Derby field after suffering a leg injury, leaving the Bob Baffert-trained horse a question mark for the first weekend in May. That withdraw means Bolt d’Oro, who was pushed to second in the Derby odds by McKinzie, will be the big favorite for Saturday’s race.

Mick Ruis’ three-year-old colt is fresh off a win in the San Felipe Stakes-G2 at Santa Anita in early March. That win and a victory in the FrontRunner Stakes-G1 at the same track bookend a third-place run in the Breeder’s Cup Juvenile. Bolt d’Oro is very comfortable at this track and ran an impressive race in March, just edging McKinzie at the wire.

Justify
This horse is the third-overall favorite to win the Kentucky Derby at 8/1 odds despite running just two races in his three-year-old career. That said, Justify has more than impressed in those limited appearances. He won by 6.5 lengths at Santa Anita on March 11 and with McKinzie out of the field, Bob Baffert will focus his attention on getting the son of Scat Daddy to the finish line first.

Now it hasn’t been confirmed that Justify will run in the Santa Anita Derby, as he was originally scheduled to race in the Arkansas Derby on April 14. However, with the withdraw of McKinzie, those plans may change. He lacks the experience of his competition in this particular race but his raw instincts and speed are being compared to past greats like American Pharoah and Bodemeister. The odds for the Santa Anita Derby will drastically shift depending on if Justify is in or out.

Instilled Regard
This horse should go off among the favorites for the Santa Anita Derby, and with McKinzie out and Justify possibly running in the Arkansas Derby instead, the price could be a little steep. Instilled Regard is set at 15/1 odds to win the Kentucky Derby and is coming off a fourth-place showing at the Risen Star-G2 at the Fair Grounds back in February.

His training sessions last week produced some positive reactions, with trainer Jerry Hollendorfer very happy with his results. This will be his longest challenge – 1 1/8 miles – after running 1 1/16 and picking up wins at that distance at Santa Anita back in October. Instilled Regard also found his way to the Winner’s Circle at 1 1/16 miles in the LeComte-G3 in New Orleans back in January.

Shivermetimbers
If you’re looking for a live long shot beyond those three front runners, this second Hollendorfer-trained horse could be it. Shivermetimbers has competed against those names above him on the odds, finishing second to Justify in the AlwOC at Santa Anita in March, fourth behind winner McKinzie in the Sham Stakes-G3 in January, and third behind McKinzie in October.

He has just one win under his belt, breaking his maiden at Del Mar in late November, and has only raced at 1 1/16 miles once, finishing seventh in the Robert B. Lewis Stakes-G3 in February. He’s the son of Shanghai Bobby, who won the 2013 Breeder’s Cup Juvenile-G1but also struggled at longer distances. He’s shown the ability to step up to his competition, so perhaps that motivation can drive him at the 1 1/8-mile distance.