(Photo credit: Kamil Krzaczynski-Imagn Images)

Gage Jump pitched seven stellar innings in his second big league start and Zack Gelof had the decisive tiebreaking single to lift the Athletics to a 2-1 victory over the host Chicago Cubs on Tuesday night.

Jump (1-1) allowed one run and three hits and retired the final 14 batters he faced in an 85-pitch effort. He struck out five and walked one.

Nick Kurtz homered to help the Athletics win for just the third time in the past 10 games.

Justin Sterner pitched a perfect eighth inning and Hogan Harris replaced an ineffective Scott Barlow to record the final out for his fifth save.

Before Harris retired the final batter, Barlow encountered troubles in the ninth as Nico Horner led off with a walk and Pete Crow-Armstrong followed with a single, Chicago's first hit since the second inning. Barlow then struck out Alex Bregman and retired Seiya Suzuki before being pulled.

The left-handed Harris came in, forcing the switch-hitting Happ to bat right-handed. Harris retired Happ on a fly to center to end it.

Bregman had the lone RBI for the slumping Cubs, who lost for the 13th time in their past 16 games.

Jameson Taillon (2-5) gave up two runs and six hits over 6 1/3 innings. He struck out six and walked one. Taillon has allowed nine homers over his past four outings.

The A's took the 2-1 lead in the fourth when Brent Rooker and Henry Bolte hit consecutive one-out singles to put runners on first and second. One out later, Gelof lined a single up the middle over the leap of Chicago second baseman Hoerner and into center to score Rooker.

Jump didn't get off a great start, giving up singles to Hoerner and Crow-Armstrong in the bottom of the first. Crow-Armstrong proceeded to steal second.

Bregman's infield grounder scored Hoerner. But the uprising was short-circuited when A's catcher Shea Langeliers gunned out Crow-Armstrong trying to steal third. Jump then struck out Suzuki to end the inning.

In the second, Jump hit Happ with a pitch and allowed a one-out single to Michael Busch, the Cubs' final hit off the 23-year-old. The inning ended when Langeliers threw out Kevin Alcantara trying to steal second with runners at the corners.

The Athletics tied the game in the third when Kurtz came up with two outs and smacked an 0-1 sweeper from Taillon over the wall in left-center.

--Field Level Media