PHOENIX — For the second time in the last four days, the Giants have scored four runs in the first inning against a left-handed pitcher. For the second time in the last four games, the Giants have failed to protect that early lead.

San Francisco dropped its fourth straight game on Tuesday night at Chase Field, losing 6-5 to the Arizona Diamondbacks as Ryan Walker allowed a walk-off infield single to Jordan Lawlar in the bottom of the ninth.

With the New York Mets beating the San Diego Padres, the Giants are now three games back of the third and final NL wild card spot.

The Giants jumped out to a commanding lead in the top of the first by putting up a four-spot against the Diamondbacks’ Eduardo Rodriguez. Matt Chapman’s sacrifice fly, Wilmer Flores’ RBI single and Jerar Encarnacion’s two

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