I am sure I also read somewhere that Andy was invited and there was some speculation about him being best man; but according to this Serbian Source
"BELGRADE / SVETI STEFAN – Novak Djokovic has not invited colleagues Ana Ivanovic and Jelena Jankovic to his, as media refer to it, wedding of the decade.
They will not show up on July 10th at the wedding Novak and his future wife Jelena Ristic will organize in Sveti Stefan in Montenegro, Serbian media reported.
Previously it was rumored that Robert de Niro, Maria Sharapova, Andy Murray would come to Montenegrin coast, but as things stand now, they will not be coming, reported Belgrade daily “Kurir”.http://inserbia.info/today/2014/07/ana-ivanovic-jelena-jankovic-not-invited-to-novak-djokovics-wedding/
Given the hype, the couple may want to keep their guest list private as long as possible.
Hope Andy gets to Miami soon.