Tennis Olympic champion Novak Djokovic pulled out of the Cincinnati Open on Thursday, just days before the beginning of the tournament. “We certainly understand that it is a quick turnaround from his Olympic triumph to come to Cincinnati,” said tournament director Bob Moran. The 34-year-old Serbian defeated Spaniard Carlos Alcaraz in Paris on Sunday to secure his first Olympic gold medal. Djokovic, a 24-time Grand Slam winner, has previously won the hard court tournament in Cincinnati three times. The tournament, which kicks off on Saturday, also serves as as a tune-up event for the US Open in…