Keldon Johnson is proving all his doubters wrong with Spurs' hot start

Keldon Johnson | Jonathan Bachman/GettyImagesWho says old dogs can't learn new tricks? San Antonio Spurs' Keldon Johnson may only be 25 years old, but he is the longest-tenured player on the team and has finally begun to play consistently.

Johnson's effort was never in question, but his production was often all over the place. One game, he could go 7-11 from the field, drill a couple of threes, and a couple of free throws en route to 18 points off the bench. The next couple of games, he might not combine to score 18, making him incredibly frustrating.

Fortunately, his play thus far has been exactly what Spurs fans skeptical about his game have been waiting for. He has been more consistent…