Nick Kyrgios has been replaced by Bernard Tomic in Australia's Davis Cup team to face Great Britain in next week's semi-final in Glasgow.
Kyrgios misses out so that he can focus on his personal and professional development after a year writing headlines for the wrong reasons.
"After some good healthy discussion with Nick and his team, we have agreed on a plan to help him develop all aspects of his game and ensure a long and successful future in the sport," Masur said. "Next week's tie has come a bit too soon for him and is not in that plan."
The three-day event takes place at the Emirates Arena between September 18 and 20, with the winner facing either Argentina or Belgium in November's final.