With the Reds ahead, 3-2, and Brayan Pena on first, Zack Cozart hit what could have been a double-play grounder. Dodgers shortstop Hanley Ramirez fired to second baseman Dee Gordon to force Pena at second, but Davis ruled that the Cozart beat the relay throw.
Looking for any opening to nip a potential Reds rally, Mattingly quickly jogged out and challenged, to no avail.
Dodgers ace Clayton Kershaw followed the challenge in short order by striking out Homer Bailey for the second out of the seventh before Billy Hamilton laced a double down the left-field line, moving Cozart to third, threatening to extend Cincinnati's lead.
But Kershaw was able to induce a bouncer to third from Todd Frazier, ending the threat.
Scott Miller is a contributor to MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.