Umbraško started his senior club career with Latvijas Basketbola līga team ASK Broceni LMT and later moved to European basketball powerhouse CSKA Moscow.
In 2002 he returned to Latvia to represent BK Ventspils and won the Latvian Championship titles in 2002 and 2003.
In 2008 he returned to Latvia to play an episodic role in VEF Riga's Latvian League triumph.
At the beginning of the 2011–2012 season, he joined Estonian team BC Rakvere Tarvas with fellow Latvians Kaspars Cipruss and Rinalds Sirsniņš.
He first represented Latvia in youth level, U22 games and caught attention of the senior team staff.