Giants outfielder Angel Pagan has been scratched from Sunday's starting lineup against Colorado because of tightness in his lower back.San Francisco Giants' Angel Pagan celebrates after scoring on Buster Posey's sacrifice fly against the Colorado Rockies during the seventh inning of a baseball game in San Francisco, Saturday, June 14, 2014.San Francisco Giants center fielder Angel Pagan makes a running catch on a fly ball hit by Colorado Rockies' Brandon Barnes during the second inning of a baseball game in San Francisco, Saturday, June 14, 2014.