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When BIG5 missing last 4 at Masters

Since 2⃣0⃣0⃣9⃣, this is 
1⃣st time at Rolex Shanghai Masters 
6⃣th time overall (at 9⃣8⃣ Masters tournaments) and 
5⃣th time at a Masters on hard court 
that any member of BIG5 (Novak DjokovicRoger FedererRafael NadalAndy Murray and Stan Wawrinka ) did not reach the last 4⃣ at a Masters!
All Masters where the same scenario happened since 2009 are the following:
2012 Rolex Paris Masters / hard court
2017 Western & Southern Open / hard court
2017 Rolex Paris Masters / hard court
2018 Miami Open / hard court 
2018 Mutua Madrid Open / clay 
2019 Rolex Shanghai Masters / hard court