John Isner returns serve against Juan Martin Del Potro of Argentine during the men's single semifinal at the Miami Open tennis tournament at Crandon Park Tennis Center in Key Biscayne on March 30, 2018.
John Isner returns serve against Juan Martin Del Potro of Argentine during the men's single semifinal at the Miami Open tennis tournament at Crandon Park Tennis Center in Key Biscayne on March 30, 2018. Pedro Portal pportal@miamiherald.com
John Isner returns serve against Juan Martin Del Potro of Argentine during the men's single semifinal at the Miami Open tennis tournament at Crandon Park Tennis Center in Key Biscayne on March 30, 2018. Pedro Portal pportal@miamiherald.com

John Isner targets Miami Open title with a strong serve

March 31, 2018 07:38 PM