"It doesn't look good for baseball," Gibbons said, "but you need to check and see what you come up with."
The review was relatively quick, clocking in at just one minute, 20 seconds, and it confirmed what first-base umpire Mike DiMuro initially called: Orioles second baseman Jonathan Schoop's throw arrived in Chris Davis' glove a split second before Toronto outfielder Darin Mastroianni stepped on the bag.
The challenge was Gibbons' 20th of the year. He has won six of them.
David Wilson is an associate reporter for MLB.com.