Kostas did in fact sign a two way contract with the Mavs per Marc Stein.
https://mobile.twitter.com/TheSteinL...27998232715264
Marc Stein
@TheSteinLine
The Mavericks have signed No. 60 overall pick Kostas Antetokounmpo to a two-way contract
8:25 PM · Jul 13, 2018
Posted via Mobile Device