Thank you for your patience in getting your apple tree question answered. I checked with some peer experts who noted the damage to your leaves could be drought stress or perhaps apple scab. Drought stress could potentially occur if your tree did not receive adequate moisture last year. Newly planted trees need 1". of water/week. Apple scab is a fungus that impacts both the leaves and the fruit. It can be carried from season to season by dropped leaves and fruit. Cultural control (picking up leaf/branch debris) can be effective. Depending on the severity you may choose to use a fungicide. Time of application is important. In addition, follow the package instructions closely. Below is a link to information regarding apple scab. 

One additional note: a peer expert noticed our tree may be planted too close to an already established tree. It is important to have enough space between trees to support them receiving sun and nutrients once full grown. If you decide to shift location, do so when in spring when the tree is healthy.  

https://extension.umn.edu/plant-diseases/apple-scab