SAN FRANCISCO — Riding a three-game sweep into the second leg of a three-city trip, the Chicago Cubs positioned themselves to put pressure on the Milwaukee Brewers heading into the final four weeks of the regular season.

They couldn’t build off their success in Anaheim, Calif., however, during their series against the San Francisco Giants, who handed them a 4-3 walk-off loss Thursday at Oracle Park to complete a sweep of the Cubs. Left-hander Shota Imanaga allowed three runs in seven innings, all coming on a pair of home runs by Willy Adames, while the Cubs (76-58) couldn’t get much going off Giants right-hander Logan Webb and the bullpen.

Manager Craig Counsell, frustrated by the strike zone, was tossed by plate umpire David Rackley after Ian Happ struck out looking to end the top of th

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