The Sarbanes-Oxley Act of 2002 requires the lead audit or coordinating partner and the reviewing partner to rotate off the audit every five years so the engagement can be viewed “with fresh and skeptical eyes.” Using data obtained from actual audits by multiple U.S. offices of three large international audit firms, we examine whether there is a relationship between evidence of reduced audit quality, measured by estimated discretionary accruals, and audit partner tenure with a specific client. We find that estimated discretionary accruals are significantly and negatively associated with the lead audit partner's tenure with a specific client. Thus, audit quality appears to increase with increased partner tenure. After controlling for client size and engagement risk, we find audit partner tenure significantly and negatively associated with estimated discretionary accruals only for small clients with partner tenure of greater than seven years, regardless of risk level. We also find that tenure is not significantly associated with estimated discretionary accruals for large clients. This suggests that as partner tenure increases, auditors of small client firms become less willing to accept more aggressive financial statement assertions by managers, and that partner tenure does not affect audit quality for large clients or for shorter-tenure smaller clients. Our results relating to audit partner tenure are consistent with the conclusions about audit firm tenure by Geiger and Raghunandan (2002); Johnson, Khurana, and Reynolds (2002);Myers, Myers, and Omer (2003); and Nagy (2005) and extend their findings by focusing on individual audit partners rather than on audit firms.