The top seeded Serb witnessed a slip in return efficiency this week in the Italian capital , marked by a combined 46 per cent break points won .
The question would be whether he could stem a dominant serving run from the second seeded Swiss .
The top seeded Serb witnessed a slip in return efficiency this week in the Italian capital , marked by a combined 46 per cent break points won , and the question would be whether he could stem a dominant serving run from the second seeded Swiss .