NYRA track announcer John Imbriale received a positive COVID-19 test result after experiencing mild symptoms following the conclusion of the Saratoga meeting, according to NYRA's Senior Director of Communications Patrick McKenna. "As a result of the mandatory 10-day isolation period, Imbriale will miss the opening weekend of the fall meet and is scheduled to return Thursday, Sept. 23," McKenna said. "In his absence, Frank Mirahmadi will handle the race calling duties Thursday, Sept. 16. Chris Griffin, who was named the lead race caller at Parx in March, will call Friday-Sunday....