Zack Greinke pitched six shutout innings as the Houston Astros beat the Oakland Athletics on Opening Day.
A's fans had to wait a year to properly boo the Astros, who were supposed to play their first road game of the 2020 season in Oakland last spring before the coronavirus pandemic altered the schedule.
Houston's sign-stealing scandal was brought to light by A's right-hander Mike Fiers against his former club, and many in the crowd at the Coliseum chanted "cheaters!"
Fans also booed the Astros during pregame introductions, and some held up signs with trash cans on them.
"Got to hear some boos, finally. That wasn't fun to listen to, I didn't think, but we played good so it didn't matter," Greinke said. "Hopefully we'll keep playing good and it won't be as big of an issue."