The turf was very firm, the pace extremely fast, and Disco Partner’s time for 6 furlongs — an insanely quick 1:05.67 — broke the Widener course record by about a second. It was a North American record, and possibly a world mark.

Disco Partner ($11.60) rocketed from eighth early under Irad Ortiz Jr. to take the Grade III Jaipur by a half-length over Green Mask. When race caller Larry Collmus saw the time, he exclaimed, “Holy mackerel!”

The blazing fractions of 21.43, 43.04 and 54.35 seconds almost guaranteed a closer would win, and New York-bred Disco Partner had a full tank to take advantage. The 5-year-old roan blasted home the final quarter-mile in under 22.5 seconds for his fifth win in nine tries on Belmont’s grass.

Last year, despite running his last quarter in 22 seconds, Disco Partner fell a neck short in the Jaipur, when Pure Sensation, now his stablemate, set the course record. Pure Sensation set the pace Saturday and understandably faded to fourth.

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“Disco Partner had a great trip,” trainer Christophe Clement said. “Irad has been riding great and he did a good job again today. He had him placed in good position and was able to finish.”

Ortiz had to alter course inside the eighth pole and found a wide seam. “I saved all the ground, and I had horse and I got through,’’ he said. “We split horses and he got there.”