The Italian will face the winner of Taylor Fritz and Matteo Berrettini in the fourth round. 

The Greek beat Nick Kyrgios in two close sets, while the German edged American John Isner, 7-6 (5), 6-7 (6), 10-5.

John Isner and Denis Shapovalov made it 3-1 after Day 1 with a late night doubles win over Matteo Berrettini and Alexander Zverev.

Without the guidance of Roger Federer, Rafael Nadal and Novak Djokovic, this could be the time for Team World in front of a rowdy Boston crowd. 

He’s just the second man to cross that milestone since the ATP began keeping track of aces in 1991.

It's unlikely, but there is a small chance two Americans will face off in an ATP Masters 1000 final for the first time since 2003, when Andy Roddick defeated Mardy Fish in Cincinnati. 

Isner is on fire with eight straight wins, but Monfils is better equipped than most players to trouble the 36-year-old.

The latest results from the best Americans from around the world. 

He was already the first Norwegian man to break the Top 30 and the Top 20, and he’s now on the verge of the Top 10.

Among them included Hans Hach Verdugo, who enjoyed a dream week on home soil alongside John Isner in Los Cabos.