Tangelo completely defoliated

[Osito]

Hey everyone
I planted this at a clients 2 weeks ago.... Looked great and healthy. Within days it dropped all its leaves and looks terrible. The branches are still pliable and green. Is there any chance or this guy? I'm assuming it really bad transplant shock. Help?

[Millet]

First you do not state your location, which would be helpful when planting a citrus tree this time of year. A citrus tree losing it leaves this fast is almost always due to transplant shock, or from planting the tree in a location with bad soil drainage.  When planting a citrus tree dig a hole just large enough for the root ball to fit. Back fill using ONLY the dirt taken from the hole.  Make a watering ring that will hold approximately 5-gallons of water, and water the tree every three or four days until the tree is established.. - Millet