Jason Heyward hit a three-run homer in the bottom of the 10th inning to give the Chicago Cubs a 4-1 win over the Cincinnati Reds on Wednesday night for their eighth victory in nine games.

Ian Happ homered for the third straight game, extending his hitting streak to a career-high nine games to help the new-look Cubs win their third consecutive series.

Joey Votto launched his 29th homer of the season, but his fourth-inning solo shot was all the offense Cincinnati could muster.

The Reds have lost four of six as they fight for a playoff spot. They entered the day tied with San Diego for the second NL wild card.

Automatic runner Willson Contreras advanced from second to third in the 10th on a single by Patrick Wisdom. Heyward then sent a drive to right field off Brad Brach (1-2).

Chicago was boosted by yet another stellar start from Alec Mills, who allowed one run and four hits over six innings. He's given up just three earned runs over his last three starts.

Rowan Wick provided two shutout innings in relief, and Codi Heuer (7-2) worked two hitless innings for the win. Heuer hasn't allowed an earned run in his last 12 outings.

Happ's first-inning solo shot off Vladimir Gutierrez nearly left Wrigley Field, but Chicago's offense went quiet afterward. The Cubs were held scoreless over the next eight innings, with just one hit.

Gutierrez gave Cincinnati five solid innings on the mound, allowing two hits and one run. Happ's homer was the lone blemish for the rookie right-hander, who struck out six.

The Cubs are off on Thursday before hosting NL West-leading San Francisco on Friday. Kyle Hendricks (14-6, 4.65 ERA) takes the mound for the Cubs, while the Giants had not yet announced their starter.