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09/30/09 3:31 AM ET

Replay converts Roberts' homer to double

D-backs left fielder robbed by Giants counterpart

SAN FRANCISCO -- An apparent home run hit by Arizona Diamondbacks left fielder Ryan Roberts in Tuesday night's fourth inning against the San Francisco Giants became a ground-rule double after the umpiring crew viewed replays of the drive.

After Miguel Montero prolonged the fourth inning against Giants starter Jonathan Sanchez by homering to right field to cut the Arizona deficit to 2-1, Roberts followed by belting a pitch over the left-field wall. But Giants left fielder Andres Torres jumped high enough to reach above the barrier and catch the ball -- which squirted out of his glove then bounced off the top of the wall before caroming back toward the field.

"I had it, but my glove came off," said Torres, whose glove slipped off his left hand as he fell over backward on the warning track. He caught the ball two-handed before brandishing it for the umpires, briefly causing many fans at AT&T Park to believe that Roberts was out.

"You have to act like you caught the ball," Torres said conspiratorially, prompting laughter from reporters.

Third-base umpire and crew chief Dana DeMuth initially signaled "home run" by twirling his hand, but after conferring briefly, he and two other umpires retreated out of sight to watch the replays, which proved that Roberts' hit was neither a home run nor an out.

"I don't have a monitor in the dugout, so I just went out for their interpretation," Arizona manager A.J. Hinch said. "You can't really argue that. [DeMuth] said when he originally called it, he thought the ball bounced out of Torres' glove and hit the back railing, which would make it a home run. After the review, [they saw] it hit the top of the wall and came back in play. It's a good rule, but this was a tough one, because it took a run off the board."

Giants manager Bruce Bochy, who left the dugout to talk briefly with the umpires, spoke favorably of the review process.

"I totally agree with this replay thing," Bochy said. "A guy should not get a home run if it wasn't over, or the other way around."

San Francisco won the game, 8-4.

Chris Haft is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.