The Astros’ archrival in the NL Central — the Chicago Cubs — announced today that their star pitcher Mark Prior may need to start the season on the disabled list due to an Achilles tendon injury and could miss 1 or 2 starts. After starting his career with a 3.32 ERA/9 RSAA (i.e., “Runs Saved Against Average”) in 19 starts in 2002, Prior had an excellent 2.43 ERA/42 RSAA in 30 starts. He has 2.74 career ERA, compared to his league average of 4.23, and 51 RSAA in 49 games. In short, he is a stud and is the Cubs’ best pitcher.