In my opinion, the Croat is the much higher player, he is accustomed to the tournament finals and his participation in the tournament, which he faces now, while the American seems more like an intruder, and he wins the last hundred meters a seat at this competition.
Marin Cilic is like saying a top player in the ATP circuit and lost in the first match of the Champions Tournament in front of young Alexander Zverez and therefore needs victory, and he has won in 14 of the last 19 duels.
Jack Sock lost this year in front of fairly modest tennis players such as Fognini, Dolgopolov, Thompson or Sugita.
Cilic also has a rematch because he lost two Socks in 2016, one of them at a Grand Slam, the US Open.
