Nathan Bohr is on a roll. PBA announced in this news release last week that Bohr has replaced Steven Black as a PBA exempt player. Black qualified for his first PBA Tour exemption through the 2010 PBA Regional Players Invitational, but requested and was granted an exemption deferral until the 2012-13 season. No reason was given for the deferral.Bohr, who previously was an exempt player, then won the PBA Midwest/Southwest Region Barney's Open over...