Dirk Nowitzki is an aquatic pioneer -- 'cause the NBA star just became the FIRST person to float in a lazy river INSIDE A BASEBALL STADIUM!!
The Frisco RoughRiders minor league baseball team invited Dirk to break in their brand new $1.5 MILLION river -- located in the outfield of Dr. Pepper Ballpark in Frisco, TX.
The river officially opens Friday.
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