What is the basis for Lutheran single predestination, as opposed to double predestination? I was reading this question, What were the main doctrinal disagreements between Luther and Calvin?, and one of the differences between the two was Calvin believed in double predestination, while Luther believed in single predestination.

So according to my understanding:


Double Predestination – God mandates who goes to Heaven AND Hell,
Single Predestination – God mandates ONLY who goes to Heaven.


Could somebody give a Lutheran support for single predestination? 

Related Question: What is the basis for Calvinist double predestination, as opposed to single predestination?

EDIT: I realize that my idea of Single predestination is, in fact, the definition of Calvinist Double predestination. Would the answer kindly provide a concise definition of Lutheran Single Predestination in addition to support?
I'll try to answer in two parts: first by summarizing the Lutheran belief concerning salvation, secondly by summarizing the Lutheran belief about who is saved.

First, the Lutheran belief concerning salvation is basically that we are saved by God's grace on account of Christ's sacrifice, and that nothing we do can gain us or earn us this salvation.  We receive the benefits of Christ's death and resurrection through faith, and this faith itself is a work of God.  Lutherans rely on passages such as Ephesians 2:8-9 and Romans 10:13-17.  Note too, that salvation is broader than going to heaven; it is being bodily resurrected at Christ's return and being brought into the new, restored creation.

Second, Lutherans believe that Christ died for the sins of all people and that God wants all people to be saved (see, for example John 3:16, 1 John 2:2, 1 Timothy 2:4-6).  However, not all people are saved.  Why?  Lutherans would say that we don't know why.  That is, if my first sentence of this paragraph is true, then the logical question is "why is not everyone saved?"  The Lutheran answer is, "we don't know, because God doesn't tell us."  

This, then, leads into the concept of single predestination.  That is, we are saved because God saves us.  Why not everyone is saved we don't have the answer to, because God doesn't tell us why.  Calvinism attempts to answer this question by "filling in the blanks," if you will, by stating that God chooses who will not believe and that Christ didn't actually die for the sins of everyone.  

As a follow-on, Lutherans believe that - without Christ - we are actually condemned already, as Jesus states in John 3:18.  This is because Adam and Eve's sin caused all of creation to be condemned, so we are born condemned.  Thus, Jesus came to save us from the condemnation in which we already were.  Therefore, it is not as if we were born into some neutral state where we could either "be saved" or "be condemned."  Actually, we were condemned already, so Christ saves us from this condemnation.