The pair, neither of whom qualified for the inaugural event a year ago, have been the most exciting breakthrough talents of 2018 so it was fitting the final pitted one against the other. 4-3 (3) in the short-set scoring format.
Stefanos Tsitsipas, ranked 15th in the world, came through 2-4, 4-1, 4-3 (7/3), 4-3 (7/3) against Alex de Minaur for his second title after Stockholm last month.
That victory set the semi-final match-ups at the Fiera Milano: Tsitsipas will face 2017 Andrey Rublev, and Group B victor Alex de Minaur will clash against Spaniard Jaume Munar.
"Before a match, everyone is different, but for me I relax and chill", Fritz said.
Also undefeated in group play, top seed Tsitsipas claimed the win and the ATP Most Improved Player of the Year trophy.
De Minaur lost to Greek Stefanos Tsitsipas 4-2, 1-4, 4-3, 4-3 in the final but had beaten some of the rising stars of Tennis around the world in getting there. Look, for example, the match today of Tsitsipas that make awesome season beating top players, and now - I'm not saying nothing bad about Munar. "I had a chance twice to win the match, but remained calm".
De Minaur has climbed more than 170 ranking spots since December, up to No. 31.
"That being said, this week there is coaching allowed, and I've made very good use of it and it's actually helped out a lot".
"I just had to dig deep", the 19-year-old said on Friday after entering the semi-finals and having dropped just one set.
"I've played some incredible tennis throughout the whole year".
"I was always, you know, had to run for the towel, always had it in my mind when I was playing".