By Jeremy Kahn

SAN FRANCISCO-After a six-game winning streak put the San Francisco Giants, the wheels have fallen off over the four days.

Chris Heston could not get out of the fourth inning, as the Pittsburgh Pirates defeated the Giants 7-4 before a sellout crowd of 41,913, the 356th consecutive sellout at AT&T Park.

After the Giants took a 2-0 at the end of the first inning, things seemed to be going well for the Giants; however the third inning came and everything imploded.

The Pirates scored four runs, as Andrew McCutchen got the Pirates on the board with a single that scored Josh Harrison, who led off the inning with a single. Gregory Polanco scored the tying run on a Heston wild pitch.

Pedro Alvarez then gave the visitors from the “Steel City,” a two-run lead, when he doubled on McCutchen and Starling Marte.

After the Pirates took the lead in the top of the third inning, the Giants came back to tie it up, when Brandon Crawford hit his eighth home run; however it came with a little controversy.

Pirates manager Clint Hurdle challenged the call of a home run, as it looked like a fan reached over the fence and interfered with the ball.

Hurdle’s challenge was denied, as after a four minute thirty five review, the play stood and the game was tied.

Nick Walker then gave the Pirates the lead for good in the top of the fourth inning, as he singled to score McCutchen.

Jordy Mercer gave the Pirates a two-run in the top of the fifth inning, as he hit his first home run of the season.

McCutchen then drove in the final Pirates run of the night in the top of the sixth inning that scored Polanco.

Heston lasted 3.2 innings, allowing five rubs on seven hits, walking three and striking out six, as his record fell to 5-4 on the season.

A.J. Burnett pitched five innings, allowing four runs on eight hits, walking two and striking out five and improved his record to 6-1 on the season.

Joe Panik grounded into a force play with the bases loaded to end of the bottom of the eighth inning.

Hunter Pence tried to give the Giants hope in the bottom of the ninth inning, as he led off the inning with a single off of Marc Melancon. Unfortunately, Posey and Brandon Belt each grounded out to second base, and Crawford popped out to Harrison for the final out.