Managers have less to argue about as Major League Baseball starts ball-and-strike challenges this season with so-called robot umpires. Tampa Bay Rays manager Kevin Cash says he likes using technology but figures there still will be reasons to argue because each team is allowed only two unsuccessful challenges. Minnesota Twins manager Derek Shelton expects less complaining early in games, but he wonders what happens after challenges run out. New York Yankees manager Aaron Boone also points out that teams have to prepare pitchers for returning to the mound when they thought the inning was over only to have an opponent win a challenge.