With a 3-0 lead after six innings, the Red Sox had a chance to sweep the Cincinnati Reds on Wednesday night at Fenway Park.

Then everything unraveled.

Greg Weissert allowed a leadoff single to open the seventh and then got a chopper hit to Abraham Toro. The third baseman bobbled the grounder. It would have been a tough double play ball, but the Red Sox didn’t record a single out because of Toro’s error. The Reds then loaded the bases on a walk, Christian Encarnacion-Strand hit a grand slam and Cincinnati added an insurance run to make it 5-3.

However, it looked like the Red Sox had something cooking in the bottom half of the inning. After a leadoff double from Marcelo Mayer, Romy Gonzalez drove him in with a ball off the wall, but inexplicably tried to stretch a double into a triple with nobody out and was thrown out at third base. It wasn’t close, and the rally was stifled.

The Reds added three more runs in the top of the eighth — two of which came on an error from Trevor Story — and Boston let another winnable game devolve into an 8-4 loss with four unearned runs.

On WEEI Thursday morning, Red Sox President Sam Kennedy said the team “definitely” needs to work on fundamentals.

“It’s been a systemic thing for a long time,” Kennedy said. “And that’s on us. That’s on everybody in the organization. It’s not acceptable to be out there at the Major League level and making fundamental mistakes. If you do that in the big leagues, if you give away outs, you’re going to be in trouble. So yes, we need to improve. Full stop.”

The Red Sox lead the American League in both unearned runs (55) and errors (72) this season.

“It’s on all of us. We’re a team and we have to be better in every area, every aspect of the game. Especially the fundamentals,” Kennedy said. “I mean, you cannot be giving away outs and expect to win baseball games. Not at the Major League level. It just doesn’t work.”

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