The 24-year-old Croatian is in the market for a new coach ahead of tennis' resumption.
Roberto Bautista Agut, Pablo Carreño Busta and Feliciano Lopez among players set to compete.
NCAA champion is newest ellesse ambassador.
Alexander Zverev is working with David Ferrer on a 15-day trial basis.
The Aussie is on the Twitter attack once again.
The World No.103 says he's not comfortable travelling to New York this year.
Former world No. 5 says there three good reasons to cancel the US Open.
