Fundamentals fly out the window in Giants’ ‘frustrating’ fourth straight loss

For much of this season’s final stretch, the Giants have had their sights on the New York Mets and the National League’s third and final wild-card spot, and they were one win away from overtaking them just a few days ago.But things have taken a drastic turn since then, and San Francisco now sits three games behind the Mets — with the Cincinnati Reds and Arizona Diamondbacks between them — after a 6-5 walk-off loss Tuesday night at Chase Field.All manager Bob Melvin could do was repeat his exasperation after the Giants’ fourth consecutive loss, which came after San Francisco failed to record a hit past the third inning and committed two errors against their NL West opponent.“It’s frustrating. It’s frustrating,” Melvin told reporters after the loss. “All these games we lose like that are frustrating, especially against a lefty we’ve had trouble against, and had a tough time with him last time. To be able to score four in the first, get another one in the third. After that, [it] didn’t even feel like we got a base runner.”For all of the trouble they’ve had with left-handed pitching this...