Chris Bassitt threw seven sharp innings against his first major league team and Matt Olson homered, leading the Oakland Athletics to a 2-0 victory over Lucas Giolito and the Chicago White Sox.

The 30-year-old Bassitt was drafted by Chicago in 2011 and made his debut with the White Sox in 2014 before he was traded to Oakland in the Jeff Samardzija deal.

Bassitt (8-5) permitted four hits, struck out seven and walked two. Olson, Robbie Grossman and Chad Pinder had two hits apiece for the Athletics, who are fighting for position in the AL wild-card race.

Giolito (12-6) struck out a career-high 13 in six innings. The All-Star right-hander allowed two runs and five hits.

The White Sox had won five of seven.

Liam Hendriks struck out two in the ninth for his 12th save in 17 opportunities.

Dylan Cease (2-4, 6.00 ERA) will start the opener of a three-game home series Monday against Houston. RHP Zack Greinke is expected to start for the Astros.