Today marks the day that the Houston Astros could begin to shop Jon Singleton on the trade market. Singleton was optioned to the minor leagues today following a rough spring training. He was competing for the starting first base job with Tyler White, Matt Duffy, and A.J. Reed, but it looks as if he is out of the running. During spring training, he hit .125 with two home runs, six RBI's, three runs, and a .176 OBP in 51 plate appearances. Singleton was once a prized first base prospect, but he has struggled to live up to those expectations since his promotion in 2014.