Summer League letdowns may brutally force the Mavericks' hand

After an average Summer League performance, the Mavericks might be forced to explore unexpected options to fill their final open roster spot.

Dallas Mavericks, Jason Kidd | Justin Ford/GettyImagesFor the Dallas Mavericks, the NBA's Summer League has officially come to an end after ending the week-and-a-half tournament with two wins and three losses after a blowout victory over the Orlando Magic on Friday. While results don't count against any team, the Mavericks saw all they needed to see when it came to Cooper Flagg and their two undrafted standout guards in Ryan Nembhard and Miles Kelly.

Not only did Flagg flash his full potential in the two games he played in, but both Kelly and Nembhard…