has warned fans are overstepping the mark after riding an emotional rollercoaster through to a mind-boggling 67th grand slam second-week appearance.
The 10-time champion told one relentless heckler to 'shut the f*** up, you f***ing idiot' during a lively third-round win over Tomas Machac at Rod Laver Arena on Friday night.
But he endeared himself with the Aussie crowd when he clapped back at one heckler who yelled incoherently at the Serbian during the match.
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