Diaz (knee) will bat leadoff as the Rays' designated hitter Sunday against the Padres, Jeff Sanders of The San Diego Union-Tribune reports.
The 33-year-old was on the bench for Saturday's contest after he exited Friday's game due to left knee patellar tendinitis, but he's back in action Sunday for the series finale. Diaz finished August with a hot bat and has a .349/.396/.558 slash line with three doubles and two homers in his past 12 games.