sentences:  In 1909 Berger faced heavyweight champion Jim Jeffries in at least five exhibitions in Pennsylvania and New York, and had two exhibition with him in California in 1910.At the time, Jeffries was one of highest paid vaudeville attractions in the United States, having retired undefeated as Heavyweight champion, and Berger's management of Jeffries was a lucrative proposition.He managed Jeffries for his fight in Reno, Nevada against black heavyweight champion Jack Johnson on July 4, 1910.