His forehand wavered at times as Cilic cleverly tried to take the pace off the ball with some floaty slices, but Zverev closed out the first set with an ace.
World number oneRafael Nadal has hinted that he could withdraw from the ATP World Tour Finals because of a troubled knee. He held to love three times in a row at the back end of the set but by then the damage had been done.
The Swiss star has triumphed at the season ending event, which features the top eight men's players, on six previous occasions. There's no more turning back.
But the 26-year-old had just missed out on the opportunity in 2014 and he has finally sealed it this year thanks to his title run in Cincinnati, and semi-final showing at the Australian Open.
That massive result against one of modern greats at the 2017 Italian Open gave the clearest indication as to just how much ability this German has with a racket.
Murray and Djokovic were joined on the sidelines for the majority of the season by Kei Nishikori, Milos Raonic and three-time Grand Slam champion Stan Wawrinka - all of whom ended 2016 in the world's top-five.
The ATP Finals found a new crowd favourite on Sunday night when Alex Zverev produced a fine comeback to beat Marin Cilic.
The 26-year-old hit the ground running in 2017, beating three top ten players on the way to winning the Brisbane International - This was Dimitrov's first ATP in almost three years.
For Zverev, he is the youngest of the group and at 20-years-old, is the youngest to qualify for the ATP Finals since Juan Martin del Potro in 2008. Dimitrov, who also won his first Masters title in Cincinnati, will be confident he can cause a major upset.
We've played some good matches - on clay in Madrid for example.
The last time a first-timer made it out of the group stage on his debut was Kei Nishikori in 2014. "It will be interesting but we hope he plays well", said the Swiss. The Belgian secured his first ATP tour title in three years with victory over Alexandr Dolgopolov at the Shenzhen Open.
The world No. 2's face had a pained look during the match when he netted with most of the court open and his opponent - having all but given the point up - bent over and facing the other way at the net.
In an interview with the New York Times this past July, Smith said she was having trouble moving after suffering a minor stroke. As news of Smith's death spread, the Today show's Al Roker paid tribute to her on Twitter.
Crowder, 24, played in his first 40 National Football League games (20 starts) before missing the Seattle game. However, they are going to continue to let backup QB Case Keenum run the offense in Week 10 against Washington.
Three carriers will be likely together around Monday, according to a South Korean military source who did not like to be named. Also on Saturday, the US and South Korean navies launched four days of joint drills off the east coast of South Korea.
Arsenal will attempt to replace Alexis Sanchez with Crystal Palace winger Wilfried Zaha , according to reports. Zaha was linked with the Gunners several years ago at the time when he moved to Manchester United .
Rivers finished the game with 235 yards and two touchdowns, but his lone interception proved to be the difference in the game. An unnecessary roughness penalty on Bosa put the Jaguars at the Los Angeles 20-yard line with 20 seconds left in the game.
Denny Hamlin: He dominated up front for most of the race until he crashed into the wall late after several bumps from Elliott. Kenseth, 45, said last weekend that he's got no ride for the 2018 season and isn't sure if he'll ever have one again.
The GRAMMY victor thanked her fans on Twitter for their well wishes on Sunday morning, also expressing gratitude for her husband. Her husband, former Nashville Predators Captain Mike Fisher , traveled back to Nashville overnight to be with her.
It is to be noted that this is not the first case of violence against the workers of the right-wing group in the state. The ABVP had held a "Kerala Chalo" Maha rally in Thiruvananthapuram with the slogan "Marxism is Terror" on Saturday.
Despite no criminal conviction Goodell suspended Elliot for six games for breaking the NFL's personal conduct policy. Jerry Jones apparently has opened yet another new front in his assault on Commissioner Roger Goodell's contract.
Shocks were felt in several Iranian cities, with eight villages damaged and electricity cut in others, local media said. A TASS correspondent reported from Kuwait City that earth tremors had been felt in that city.
Red Sox going after Giancarlo Stanton?
Now the Miami Herald is reporting "talks between the Red Sox and Marlins involving a trade for the slugger may be heating up". There's also the matter of what young players the Red Sox would part with to make a deal and beat out the other suitors.
Louis CK's Collaborator Pamela Adlon 'Devastated and in Shock'
Additionally, C.K.'s new film, I Love You Daddy will not be released by its distributor The Orchard, as reported by The Verge. Pamela Adlon , who stars in " Better Things ", which she co-created with C.K., said she was devastated by the developments.
DeShone Kizer returns to Browns vs. Lions game
He'd been sacked just once, too, and was showing off the poise that's eluded him for the vast majority of his rookie campaign. The Cleveland Browns linebacker picked off Detroit Lions QB Matthew Stafford inside Lions territory with a nice low catch.