Ken Griffey, Jr. and Mike Piazza have been elected to baseball's Hall of Fame and will be enshrined this summer.

Griffey was elected with the highest voting percentage ever. He was on 437 of 440 ballots in his first appearance. His 99.3 percentage topped the previous mark of 98.84, set when Tom Seaver appeared on 425 of 430 ballots in 1992.

"I can't be upset. It's just an honor to be elected and to have the highest percentage is definitely a shock," Griffey said.

After falling 28 votes shy last year, Piazza received 365 votes in his fourth time on the ballot and will be inducted along with Griffey on July 24.

"Incredibly special. Wow," Piazza said.

The announcement of the National Baseball Hall of Fame's Class of 2016 will be made by Hall president Jeff Idelson on Wednesday at 6 p.m. ET in a simulcast on MLB Network and MLB.com.