#2 Maxi Kleber
After going undrafted in 2014, Kleber played for a Spanish club followed by two years with Bayern Munich before signing with the Mavericks in July of 2017.
In his second year with the Mavs, Maxi played 71 games - of which he started in 18 - and got over 21 minutes of playtime per matchup. During all that time on the court, all he could manage was a subpar scoring average of 6.8 points, 4.6 rebounds and 1.6 assists per game.
With over 5 attempts per game, his field-goal conversion dropped to 45%. Moreover, playing as a power forward for Dallas, he went to the line barely once every game and had an ordinary 76% shooting from the FT line.
Kleber was BBL's most effective player just a couple of years ago (2017) but evidently so, his style of play hasn't translated well from Europe to the NBA.