"The match was great, obviously", said the 31-year-old.
Pleased to see Ronaldo watching tennis, Djokovic, who was wearing black and white, jokingly said, "I had colours of his club on my attire tonight". I managed to get three breaks of John's serve which is sometimes mission impossible, but I managed to be at the right place at the right time, and I held my serve very well and played solid.
It's just as Novak described him to be an enthusiast for the game that the 33-year-old soccer player appeared to be from his box seats. Zverev nailed a trademark backhand victor down the line to earn five more match points and converted the first with a powerful first serve that Cilic could only fend into net.
His final group match is against Cilic while Zverev will hope to bounce back against Isner.
"I am going to enjoy some quality time with my family and then get ready for the last game in the group".
The Serb is a red-hot favourite to draw level on six titles at the season finale with Federer, who faces an uphill task to reach the semifinals after his loss in his first round-robin match.
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Djokovic is chasing a sixth ATP Finals title and his first in the prestigious season-ending event at London's O2 Arena since 2015.
The Croatian had further chances to break at 3-0 and 4-1 but wasn't able to convert as Zverev dug in.
It was a crucial escape for the 14-time Grand Slam champion, who stepped up the pressure on Zverev to steal a hard-fought first set. Djokovic continued to dominate on his serve and immediately pushed for another break, eventually finding the breakthrough in the fourth game to lead 3-1.
Cilic's lead didn't last long, however, as an unforced error of his own gifted Zverev the break to bring it back to 4-4.
"I found it more hard than in the first match against John Isner".
Further errors from Cilic saw Zverev race to a 5-1 lead before a classy backhand victor and a unreturnable serve sealed the second-set tiebreak, as well as the opening win.