LAS VEGAS — Christian Yelich slid home ahead of the throw on an infield grounder in the 12th inning, giving the Milwaukee Brewers a wild 15-14 comeback victory over the Athletics on Monday in the opener of a three-game series in Las Vegas, the future home of the A’s. Yelich, the automatic runner, stole third to open the 12th. Jose Suarez (0-2) struck out Jackson Chourio, but Yelich then scored on Brice Turang’s fielder’s-choice grounder.