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Chicago Cubs starting pitcher Edwin Jackson delivers during the first inning of a baseball game against the Colorado Rockies, Tuesday, July 29, 2014, in Chicago. (AP Photo/Charles Rex Arbogast) ( Rockies Cubs Baseball )

Colorado Rockies' Justin Morneau hits a two-run double off Chicago Cubs starting pitcher Edwin Jackson, scoring Nolan Arenado and Carlos Gonzalez, during the first inning of a baseball game Tuesday, July 29, 2014, in Chicago. (AP Photo/Charles Rex Arbogast) ( Rockies Cubs Baseball )

Colorado Rockies first baseman Justin Morneau (33) and second baseman DJ LeMahieu eye a pop up by Chicago Cubs' Starlin Castro during the first inning of a baseball game Tuesday, July 29, 2014, in Chicago. Morneau makes the catch on the play. (AP Photo/Charles Rex Arbogast) ( Rockies Cubs Baseball )

Chicago Cubs' Anthony Rizzo hits an RBI single off Colorado Rockies starting pitcher Jorge De La Rosa, scoring Emilio Bonifacio, as catcher Wilin Rosario and home plate umpire Phil Cuzzi watch, during the first inning of a baseball game Tuesday, July 29, 2014, in Chicago. (AP Photo/Charles Rex Arbogast) ( Rockies Cubs Baseball )

Chicago Cubs' Arismendy Alcantara is hit by a pitch from Colorado Rockies starting pitcher Jorge De La Rosa during the second inning of a baseball game Tuesday, July 29, 2014, in Chicago. (AP Photo/Charles Rex Arbogast) ( Rockies Cubs Baseball )

Left fielder Justin Ruggiano #20 of the Chicago Cubs misplays a a ball off the bat Justin Morneau of the Colorado Rockies that went for a double, and allowing Morneauto advance to third base during the first inning on July 29, 2014 at Wrigley Field in Chicago, Illinois. (Photo by Brian Kersey/Getty Images) ( 452906104 )

Fans are silhouetted as they watch a baseball game between the Chicago Cubs and the Colorado Rockies, as the sun sets in the West, Tuesday, July 29, 2014, in Chicago. (AP Photo/Charles Rex Arbogast) ( Rockies Cubs Baseball )

Chicago Cubs' Emilio Bonifacio beats the throw from Colorado Rockies second baseman DJ LeMahieu to first baseman Justin Morneau, during the second inning of a baseball game Tuesday, July 29, 2014, in Chicago. (AP Photo/Charles Rex Arbogast) ( Rockies Cubs Baseball )

Colorado Rockies starting pitcher Jorge De La Rosa delivers during the first inning of a baseball game against the Chicago Cubs, Tuesday, July 29, 2014, in Chicago. (AP Photo/Charles Rex Arbogast) ( Rockies Cubs Baseball )

Chicago Cubs' Starlin Castro hits a game winning sacrifice fly off a pitch from Colorado Rockies relief pitcher Tyler Matzek, scoring John Baker, during the 16th inning of a baseball game Tuesday, July 29, 2014, in Chicago. The Cubs' won 4-3. (AP Photo/Charles Rex Arbogast) ( Rockies Cubs Baseball )

Colorado Rockies' Corey Dickerson (6) scores past Chicago Cubs catcher Welington Castillo on a double by Nolan Arenado during the first inning of a baseball game Tuesday, July 29, 2014, in Chicago. (AP Photo/Charles Rex Arbogast) ( Rockies Cubs Baseball )

Nolan Arenado #28 of the Colorado Rockies hits an RBI double, scoring teammate Corey Dickerson during the first inning against the Chicago Cubs on July 29, 2014 at Wrigley Field in Chicago, Illinois. (Photo by Brian Kersey/Getty Images) ( 452906102 )

Starlin Castro #13 of the Chicago Cubs flips his bat after popping up with runners in scoring position during the first inning against the Colorado Rockies on July 29, 2014 at Wrigley Field in Chicago, Illinois. (Photo by Brian Kersey/Getty Images) ( 452906084 )

Anthony Rizzo #44 of the Chicago Cubs connects on an RBI single, scoring Emilio Bonifacio during the first inning on July 29, 2014 at Wrigley Field in Chicago, Illinois. (Photo by Brian Kersey/Getty Images) ( 452906098 )

Starting pitcher Jorge De La Rosa #29 of the Colorado Rockies wipes his head as he stands on the mound during the second inning against the Chicago Cubs on July 29, 2014 at Wrigley Field in Chicago, Illinois. (Photo by Brian Kersey/Getty Images) ( 452906090 )

Third baseman Emilio Bonifacio #64 (L) and catcher Welington Castillo #5 of the Chicago Cubs talk with starting pitcher Edwin Jackson #36 during the fourth inning against the Colorado Rockies on July 29, 2014 at Wrigley Field in Chicago, Illinois. (Photo by Brian Kersey/Getty Images) ( 452907334 )

Manager Rick Renteria #16 of the Chicago Cubs asks second base umpire Gerry Davis #12 for a review of a play during the fourth inning against the Colorado Rockies on July 29, 2014 at Wrigley Field in Chicago, Illinois. (Photo by Brian Kersey/Getty Images) ( 452907356 )

Nate Schierholtz #19 of the Chicago Cubs high-fives teammate Emilio Bonifacio #64 after Bonifacio hit a two-run home run scoring Schierholtz during the fourth inning against the Colorado Rockies on July 29, 2014 at Wrigley Field in Chicago, Illinois. (Photo by Brian Kersey/Getty Images) ( 452907346 )

Emilio Bonifacio #64 of the Chicago Cubs is greeted at the dugout after hitting a two-run home run, scoring Nate Schierholtz during the fourth inning against the Colorado Rockies on July 29, 2014 at Wrigley Field in Chicago, Illinois. (Photo by Brian Kersey/Getty Images) ( 452907350 )

DJ LeMahieu #9 of the Colorado Rockies fails to connect on a suicide squeeze bunt during the tenth inning against the Chicago Cubs on July 29, 2014 at Wrigley Field in Chicago, Illinois. (Photo by Brian Kersey/Getty Images) ( 452910514 )

Justin Morneau #33 of the Colorado Rockies (C) is caught in a rundown between catcher Welington Castillo #5 and third baseman Emilio Bonifacio #64 of the Chicago Cubs after DJ LeMahieu failed to lay down a suicide squeeze bunt during the tenth inning on July 29, 2014 at Wrigley Field in Chicago, Illinois. Morneau was tagged out by Castillo. (Photo by Brian Kersey/Getty Images) ( 452910522 )

DJ LeMahieu #9 of the Colorado Rockies slams his bat into the ground after after failing to connect on a suicide squeeze in the tenth inning against the Chicago Cubs on July 29, 2014 at Wrigley Field in Chicago, Illinois. (Photo by Brian Kersey/Getty Images) ( 452910534 )

John Baker #12 of the Chicago Cubs (R) scores past catcher Wilin Rosario #20 of the Colorado Rockies on a game-winning sacrifice fly hit by Starlin Castro during the 16th inning on July 30, 2014 at Wrigley Field in Chicago, Illinois. The Cubs defeated the Rockies 4-3 in 16 innings. (Photo by Brian Kersey/Getty Images) ( 452912598 )

Chicago Cubs' John Baker, left, scores the game winning run off a sacrifice fly by Starlin Castro, as the ball gets past Colorado Rockies catcher Wilin Rosario (20) during the 16th inning of a baseball game Tuesday, July 29, 2014, in Chicago. The Cubs' won 4-3. (AP Photo/Charles Rex Arbogast) ( Rockies Cubs Baseball )

First base coach Eric Hinske #77 of the Chicago Cubs (R) congratulates Starlin Castro #13 after Castro hit a game-winning RBI single scoring John Baker during the 16th inning against the Colorado Rockies on July 30, 2014 at Wrigley Field in Chicago, Illinois. The Cubs defeated the Rockies 4-3 in 16 innings. (Photo by Brian Kersey/Getty Images) ( 452912584 )