Michaella McCollum Connolly and Melissa Reid have been taken from the Peruvian prison where they have been held for eight weeks to a court hearing of the drug smuggling charges.
One or both of the British women are expected to plead guilty as part of a deal with prosecutors to secure a shorter sentence.
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The former footballer said 'unbelievable' paranoia during his drug addiction led him to believe his Rolex watch was "listening" to him.
Devon Staples had been drinking during Independence Day celebrations when he placed a fireworks on the top of his head and lit the fuse.
World Number 4 Murray has won their previous five encounters, but Karlovic tops the tournament's aces leaderboard so far.