Races that are declared non-wagering events are required to be treated as “all” bets in multi-race wagers, officials with knowledge of bet-processing rules said Monday.

B. Douglas Thomas, a journeyman rider who finished his 30-year career with nearly 2,100 career wins and multiple riding titles in New Jersey died on March 9 of a heart attack at his home in Sun City West, Ariz., according to his family. Thomas was 78.

A native of Canada who began his riding career at Fort Erie racetrack in the 1960s, Thomas was one of the leading riders at Monmouth and the Meadowlands in the late 70s and early 80s. From 1977-81, he amassed 690 wins from 5,514 starts and nearly $7 million in earnings.

The sixth race at Los Alamitos on Sunday evening was cancelled after five of the six runners were scratched, according to the track’s website and two trainers.

The sixth race, an allowance race at 1,000 yards, was open to Quarter Horses and Thoroughbreds and drew a field entirely of Thoroughbreds.

As a result, betting was cancelled on the $2 pick six, the $1 place pick all, the late $1 pick four and $1 pick three bets beginning with the fourth and the sixth races, according to a track official.

ARCADIA, Calif. - Tamara, the beaten favorite in the Breeders’ Cup Juvenile Fillies at Santa Anita in November, recently resumed training at Santa Anita for a springtime comeback.

“She’s galloping,” trainer Richard Mandella said Sunday. “She won’t work for another couple of weeks. She looks great.”

ARCADIA, Calif. - Newgate, winner of the Grade 1 Santa Anita Handicap on March 3, and Hopkins, second by a nose in a thrilling running of the Grade 3 Palos Verdes Stakes on Feb. 10, are bound for world-class stakes at Meydan Racecourse in Dubai on March 30, trainer Bob Baffert confirmed on Sunday.

Newgate will start in the $12 million Dubai World Cup at 1 1/4 miles, a race Baffert has won four times. Newgate has won 3 of 9 starts. The Big Cap was the 4-year-old colt’s most prestigious win and first career start at 1 1/4 miles.

The disruption on Saturday that led Tampa Bay Downs to run its most prestigious race, the Tampa Bay Derby, as a non-wagering event was caused by a communications outage between the bet-processing center at AmTote and the track, according to a joint statement from the communications provider and the parent company of AmTote.

OLDSMAR, Fla. - Lucrative pots in Kentucky await many of the undercard stakes winners from Saturday’s Tampa Bay Derby program, it’s just a matter of choosing whether to run at Keeneland, Churchill Downs or both.

Sparkle Blue, the front-running, half-length winner of Saturday’s Grade 2 Hillsborough Stakes, is likely to make her next start in the Grade 3, $400,000 Modesty Stakes at Churchill Downs on May 3, trainer Graham Motion said.

OLDSMAR, Fla. - Domestic Product and No More Time, separated by a neck at the finish of Saturday’s Grade 3 Tampa Bay Derby, will likely take different paths to the Kentucky Derby, their connections said Sunday.

Tampa Bay Downs in Oldsmar, Fla., will seek an “independent, third-party investigation” of a meltdown of the bet-processing network on Saturday that resulted in the track having to run its most prestigious race, the Tampa Bay Derby, as a non-wagering event, the track’s general manager said Sunday morning.

Hall of Fame trainer D. Wayne Lukas knows a Preakness prospect when he sees one as a six-time winner of the middle jewel of the Triple Crown, and he’s hoping Seize the Grey could develop into a candidate for the race. The horse defeated a deep field of 3-year-olds in a first-level allowance on the Rebel undercard Feb. 24 at Oaklawn.

“He might be a Preakness horse,” Lukas said.

Seize the Grey has since come back and worked a sharp five-eighths, going in 59.60 seconds March 3 at Oaklawn.