Ivo Karlovic, shown in a file photo, defeated teen Thanasi Kokkinakis in two tiebreakers in the second round of the Delray Beach Open on Wednesday, Feb. 18, 2015.
Ivo Karlovic, shown in a file photo, defeated teen Thanasi Kokkinakis in two tiebreakers in the second round of the Delray Beach Open on Wednesday, Feb. 18, 2015. Pedro Portal El Nuevo Herald
Ivo Karlovic, shown in a file photo, defeated teen Thanasi Kokkinakis in two tiebreakers in the second round of the Delray Beach Open on Wednesday, Feb. 18, 2015. Pedro Portal El Nuevo Herald