Sleeper, which has developed a social and gaming platform for sports, has raised a $20 million Series B led by Andreessen Horowitz (a16z). A slew of other (high-profile) investors participated in the investment, which brings the San Mateo, California, company’s total venture raised to $27.3 million since its 2015 inception, according to Crunchbase data. Also putting money into the Series B were NBA Star Baron Davis, NFL Pro Bowler JuJu Smith-Schuster, ESPN analyst Ros Gold Onwude, Twitch COO Kevin Lin, and the a16z Cultural Leadership Fund. Existing backers General Catalyst, Birchmere Ventures and Rainfall were involved as well. NBA Star Kevin Durant and Thirty Five Ventures co-founder Rich Kleiman participated in the Sleeper’s Series A.