Must played the 2007 BWF World Championships in men's singles, and was defeated in the first round by Björn Joppien, of Germany, 21–12, 21–11.

Must also played the 2008 Olympic Games in men's singles, and was defeated in the first round by Przemysław Wacha, of Poland, 14–21, 15–21.

At the 2016 Rio Olympics he again won a groupsmatch, this time against Brice Leverdez from France with 21-18, 12-21, 21-18.

But lost the other groups match against Dane Jan Ø. Jørgensen with 8-21, 15-21 so didn't advance further.

For the 2020 Tokyo Olympics Must has been placed by draw in a group with Chen Long from China and Pablo Abián from Spain.