Sergio Romo just missed with a strikeout pitch, issuing a leadoff walk instead. That was the start of his trouble.San Francisco Giants' Tyler Colvin follows the flight of his RBI-double against the Colorado Rockies in the ninth inning of the Rockies' 5-4 victory in a baseball game in Denver on Tuesday, May 20, 2014.Colorado Rockies' Nolan Areando follows the flight of his walkoff double to drive in two runs against the San Francisco Giants in the ninth inning of the Rockies' 5-4 victory in a baseball game in Denver on Tuesday, May 20, 2014.San Francisco Giants' Brandon Hicks charges around third base to score the go-ahead run on a double by Tyler Colvin in the top of the ninth inning of the Giants' 5-4 loss to the Colorado Rockies in a baseball game in Denver on Tuesday, May 20, 2014. Giants' relief pitcher Sergio Romo gave up a two-run, walkoff double to the Rockies' Nolan Arenado to squander the lead in the bottom half of the inning.Colorado Rockies' Nolan Arenado, second from left on top, celebrates his walkoff double to drive in two runs with teammates, from left, Corey Dickerson, Charlie Culberson and DJ LeMahieu against the San Francisco Giants in the ninth inning of the...