"It's something I thought would be really cool for it to happen, and it's coming to fruition," said Hudson, who spent 1999-2004 with the A's and migrated to Atlanta before joining the Giants prior to the 2014 season. Zito rose to the Majors with the A's in 2000, joined the Giants as a free agent in 2007 and sat out last season before returning this year to pitch at the Triple-A level with Oakland.
"I hope the fans appreciate it," Hudson said.
Sunday, Hudson and Zito will be joined by the the third member of that vaunted A's rotation, left-hander Mark Mulder, as all of them will throw ceremonial first pitches.