[9] With starting goalkeeper Hans-Jörg Butt serving a suspension following a red card, Adler saved ten shots on goal, repelling Schalke's repeated attacks.

[10] He stopped Schalke's record of 13 games unbeaten, VfB Stuttgart's record of five games unbeaten and Hamburger SV's four-game winning spree with a saved penalty kick against Rafael van der Vaart.

[5] On 8 March 2008 Adler made his first international appearance, losing the UEFA Cup round of last 16 first leg against RC Lens.

[11] In the following years, Adler continued to be the first-choice goalkeeper until newly signed Bernd Leno took his place due to injuries.

[20] In May 2017, Adler announced that he would not extend his contract with Hamburger SV and leave the club after five years.

[23] Adler has been a club captain at all levels of competition and at the German Under-19 championships he was one of the star players of the tournament.

After the retirement of Jens Lehmann and death of Robert Enke, he became first choice during the World Cup qualifying.

Despite having been confirmed as Germany's main team goalkeeper for the World Cup, a serious rib injury prevented him from travelling to South Africa.

He was out of contention for the national team for two years, but was recalled in November 2012 for a friendly against the Netherlands after putting in impressive performances since joining Hamburger SV.