Jockey Phil Grove injured his leg yesterday when thrown from Mystery Key in the fourth race at Bowie Race Course.

Mystery Key, a maiden, was in the middle of the 12-horse field when his right foreleg snapped and he fell to the ground. Grove rolled clear of several horses. He was admitted to Prince George's Hospital, where X-rays showed no broken bones. He was listed in good condition.

Charles (Chick) Lang, Pimlico's general manager, is negotiating a deal to televise racing from Pimlico to Nevada beginning with the March meeting. A similar plan fell through last year.

The complicated case of the horse Bob Hancock has been resolved. Bob Hancock had been claimed from a winning race, but several months later was found to have been technically ineligible for that race. The racing stewards disallowed the claim but have been overruled by the Maryland Racing Comission.

The Charles Town Turf Club will open its 1983 season at 7:15 p.m. today. Mondays and Tuesdays will be dark in the meeting, which will end Nov. 12 with the $75,000 Tri-State Futurity.

The first of 10 stakes races will be the $10,000 Shenandoah April 16.