Serbian tennis great Novak Djokovic has won his first Olympic gold medal after beating Spaniard Carlos Alcaraz 7-6 (7-3), 7-6 (7-2) in the final of the men’s singles in Paris. Top seed Djokovic, the record men’s grand slam champion with 24 titles, wasted three break points at 2-1 in the first set and edged a marathon service game for 5-4 before spurning set point at 6-5. But he prevailed in the tie-break with a forehand winner and cool volley. Second seed Alcaraz, who won the French Open in June on the same Roland Garros venue in Paris, beat 2008 bronze medallist Djokovic in last month’s Wimbl…