Petros only actually played Rios twice, once when Rios was still a teen at Roland Garros and at the end of Rios career indoors. Both times Rios tested Peter and gave him trouble. Prime Rios could have conceivably toyed with Petros like he did Andy Agassi in Miami and Munich.
"He looked like he was trying to imitate Sampras when I first played him." Agassi in Facing Federer