Roski became a minority owner of the Los Angeles Kings in 1995 and a minority owner of the Los Angeles Lakers in 1998. Roski and Philip Anschutz were majority owners of the Los Angeles Arena Company, looking to replace the Great Western Forum for the Kings, and exercised an option to buy 25% of the Lakers, with the Lakers agreeing to become a tenant in the planned arena. Roski and Anschutz developed the Staples Center for both teams. During his minority ownership, the Lakers won NBA Championships in 2000, 2001, 2002, 2009 and 2010; and the Kings won the Stanley Cup in 2012 and 2014.