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Ravi Kumar 6740Ravi Kumar 6740 

How to make default value of Lightning :Select as Blank?

SwethaSwetha (Salesforce Developers) 
HI Ravi,
Based on similar asks from past, https://developer.salesforce.com/forums/?id=9060G000000MQlHQAW, https://salesforce.stackexchange.com/questions/154899/lightningselect-set-default-value-based-on-sobject-list-from-apex-controller can you try something like in your controller? 
component.find("yourOption").set("v.value", " ");

If this information helps, please mark the answer as best. Thank you
Suraj Tripathi 47Suraj Tripathi 47
Hi Ravi,
Greetings!

In the handler method, you need to set the value of the component. 
component.find('componentName').set('v.value', '');

If you find your Solution then mark this as the best answer. 

Thank you!
Regards,
Suraj Tripathi