The Danish teenager saved four championship points before winning a thrilling final, and had kind words for his Dutch rival on Twitter after the match.

Iga Swiatek and Aryna Sabalenka will battle for the Stuttgart title for the second year in a row, while Botic van de Zandschulp will also get another shot at Holger Rune in Munich.

Elsewhere Wednesday, Casper Ruud stayed hot, Lorenzo Musetti posted a double bagel and Karen Khachanov set a showdown with Andrey Rublev.

Fourth-seeded Casper Ruud has extended his winning streak on clay to nine matches reaching the third round at the Monte Carlo Master.

Unfortunately for Fucsovics and Krajinovic, their almost wins turned into deflating defeats on Monday.

In addition to this battle between two of the world's brightest 21-and-under stars, we're keeping our eyes on three other matches.

The 19-year-old Spaniard clinched the win against Botic van de Zandschulp in a second-round match where he had 20 winners and made just nine unforced errors.

The American is aiming for a career-best result at his home tournament after an impressive start to his US Open swing, and will play a final set against Botic van de Zandschulp on Friday.

Fognini is known for his abilities on clay, but his opponent has put together a sneaky-good season on the dirt.

The Miami Open finalist earned his best result of the clay swing at the Foro Italico with a seamless victory over Jenson Brooksby.