World No.4 Alexander Zverev (GER) has withdrawn from the World Tennis Challenge.
Fernando Verdasco will play Borna Coric in the men’s singles match this evening.
Zverev will address the crowd before play commences.
World Tennis Challenge General Manager David Hearne said: “We are sad that Zverev has withdrawn from the World Tennis Challenge.
“We know that he was excited to play in Adelaide and Verdasco will now replace him tonight.”