San Francisco Giants shortstop Brandon Crawford (knee) is experiencing left knee discomfort and will be shut down for one week in spring training. It's not a great sign for a player that his 36 years old, and there's a chance he may not be ready for Opening Day at the end of March. If Crawford isn't ready for the start of the regular season, Thairo Estrada could open the year as the Giants' starter at the 6. Crawford also missed time last summer with knee inflammation, so this is something to ...