Alexander Zverev reaches Miami Open semis with win over Borna Coric

Borna Coric returns a shot from Alexander Zverev during a quarterfinal at the Miami Open. | AP

Alexander Zverev argues a call during a during a quarterfinal tennis match against Borna Coric at the Miami Open. | AP

Borna Coric argues a call during a quarterfinal tennis match against Alexander Zverev at the Miami Open. | AP

Alexander Zverev hits a forehand to Borna Coric during a quarterfinal at the Miami Open. | AP

Borna Coric hits a return to Alexander Zverev during a quarterfinal at the Miami Open. | AP

Alexander Zverev serves to Borna Coric during a quarterfinal tennis match at the Miami Open. | AP

Alexander Zverev hits a returns to Borna Coric during a quarterfinal at the Miami Open. | AP

Alexander Zverev celebrates after defeating Borna Coric 6-4, 6-4, during a quarterfinal at the Miami Open. | AP

Former NBA basketball player Scottie Pippen, right, watches as Alexander Zverev, foreground, celebrates after defeating Borna Coric 6-4, 6-4, during a quarterfinal at the Miami Open. | AP