Opelka: How did Djokovic manage to win game against Brooksby in first set at US Open?

Top-ranked American tennis player Reilly Opelka wondered how world No. 1 Novak Djokovic managed to win a set against Jenson Brooksby at the US Open. Brooksby came out firing against Djokovic but the Serb recovered from a set down to beat the American 1-6 6-3 6-2 6-2. On Tuesday, Brooksby handed a 6-4 6-4 loss to Opelka in the Antwerp first round. "How (expletitive) did Novak Djokovic win a game against this guy in the first set (at the US Open)," the microphones caught Opelka wond