Ocean View defeated the team from Hamamatsu, Japan 2–1 to win the Little League World Series Championship.

He was named California's high school player of the year by the Los Angeles Times and the Orange County Register.

[6] Danner was considered a top prospect at both pitcher and catcher prior to the 2017 Major League Baseball draft.

[10] In 2018, Danner played with the Rookie Advanced Bluefield Blue Jays, where he hit .279 with two home runs and 19 RBI in 32 games.

[17] He made his MLB debut that night against the Chicago Cubs, but retired only one batter before leaving with an injury.

Danner retired Seiya Suzuki on a line drive out and reached a full count on the next batter, Yan Gomes, before departing with an injury.

He made 33 relief appearances for Buffalo, compiling a 3–0 record and 3.15 ERA with 34 strikeouts and 7 saves across 34+1⁄3 innings pitched.

[27][28] Danner's childhood best friend and former Little League and high school teammate is MLB player Nick Pratto.