Andy Murray has acknowledged that his return game will need to be on point ahead of meeting Ivo Karlovic in the last 16 of Wimbledon on Monday.
The towering world number 25 served 41 aces in his third-round win over Jo-Wilfried Tsonga, and Murray knows exactly what to expect from the hard-hitting Croat.
"It will be a very different match from today. Ivo is going to be coming to the net a lot," the third seed, who has never lost to Karlovic, told BBC Sport.
"Returns will have to be on if I want to get through that one."
The Scot has won all five of his previous meetings with the 6'11 Karlovic.
