Chicago’s Brian Anderson, back, slides safely into home past the tag of Kansas City catcher Miguel Olivo in the ninth inning. The White Sox beat the Royals, 7-4, Sunday in Kansas City, Mo.

Kansas City, Mo. ? With a 4-1 lead and Zack Greinke on the mound, the Kansas City Royals felt relaxed and confident.

Next time, they’ll know better.

Chris Getz completed a Chicago comeback with a tiebreaking two-run single off Juan Cruz in the ninth inning Sunday, and the White Sox rallied for a 7-4 victory and their first three-game sweep in Kansas City since 2005.

“As soon as you start thinking you’ve got the game in hand, things change,” Royals center fielder Willie Bloomquist said. “Zack’s human. He’s not going to throw a shutout every time. We’ve got to continue to get him runs and keep piling on when we get a lead.”

Greinke, going for his major-league-leading ninth win, went seven innings and gave up eight hits in what would be a decent outing for most major-league pitchers but was easily his worst.

“When you’re down 3-1 with Greinke pitching, most teams would say, ‘We’ve already won the series, let’s pack it in and go to Chicago,”‘ manager Ozzie Guillen said. “But we didn’t. We battled. That’s what we’ve been doing lately.”