Majesty's Prince, ridden by Laffit Pincay Jr., rallied in the deep stretch and won the $600,000 Rothmans International at Woodbine in Toronto, with heavy favorite All Along fourth.

Majesty's Prince ($7.70), well behind the leaders most of the 1 5/8-mile route on the Marshall turf course, caught 90-to-1 shot Jack Slade and won by two lengths. Majesty's Prince, a 5-year-old chestnut, earned $360,000 for John Marsh of Gainesville, Va.

All Along, who won the Washington, D.C. International and was horse of the year in North America for 1983, came in fourth, a neck behind Esprit du Nord, who was a nose shy of Jack Slade . . .

Sabin showed her heels to an international field of throughbreds with a 2 1/4-length victory in the $400,000 Yellow Ribbon Stakes for fillies and mares on the grass at Santa Anita. Winning for the eighth time in nine 1984 starts, the 4-year-old flown west from trainer Woody Stephens' care in New York established herself as the leading contender for the Eclipse Award as best filly or mare racing on grass.

Sabin ($4.40) raced the 1 1/4 miles in the excellent time of 2:00 and brought a purse of $240,000 to owner Henryk de Kwiatkowski to go with the $703,106 the filly won in 15 previous victories out of 21 starts . . .

At New York's Belmont Park, Life's Magic ($4.80) dueled Miss Oceana for most of the 1 1/4 miles of the $218,000 Beldame for fillies and mares before edging away in the stretch for a 3 3/4-length victory in 2:03 1/5.

It was the second success for the Eugene Klein-owned mount against Miss Oceana in five meetings between the two 3-year-old fillies; Miss Oceana also won two.

In the Beldame Life's Magic was ridden by Jorge Velasquez, Miss Oceana by Pat Day.