Alejandro Andrade of Ecuador arrives at the Zagreb quarter-finals as the 215th-ranked player seeking to make his mark on the ATP clay courts. The Ecuadorian has shown mixed form in recent matches, posting two wins against A. Mayo and O. Crawford alongside losses to N. Basavareddy and S. Dostanic. Andrade defeated T. Monteiro in a close three-setter most recently, demonstrating his capacity to compete in tight matches. This will be his first career meeting with E. Moller, with no previous head-to-head record between the two players.

Elmer Moller of Denmark enters the Zagreb quarter-finals ranked 153rd on the ATP tour, where he'll face Alejandro Andrade on clay. The Danish competitor has recorded three wins in his last five matches, including victories over N. Fatic and F. Cina, though he also suffered defeats to N. Basilashvili and J. Sinner during this stretch. Moller's recent performances show competitive form, with one loss coming against the top-ranked Sinner in straight sets. The two players meet for the first time at Zagreb with no established head-to-head history.