First-round draft choice Matt Leinart was scheduled to be throwing to Arizona Cardinals receivers today, the initial day of training camp practice, the agent for the former Southern California quarterback instead threw in the towel on contract negotiations. "We've been [in the Phoenix area] since Friday and couldn't get it done," agent Tom Condon said Sunday night, after three days of face-to-face negotiations failed to produce an agreement for the 2004 Heisman Trophy winner. "We're hung up on a lot of issues. It's time to go home." The 10th overall choice in the draft was a steal after he posted a brilliant 37-2 record as the Trojans' starter for three seasons. Leinart missed the team's Sunday evening deadline for reporting to training camp at Flagstaff, Ariz.