Ruiz is hitting .500 (11-for-22) with a .593 on-base percentage and a 1.502 OPS with six extra-base hits and seven RBIs since Monday. He has also scored eight runs in the six games and racked up five hits in six at-bats with runners in scoring position during that span.
"He's just clutch," Phillies manager Ryne Sandberg said. "He's using the whole field and he's big in situations. He's just red-hot."
Ruiz had only 10 hits in his first 49 at-bats during his first 14 games of the season. He had four extra-base hits and no RBI during that stretch.
"I just want to carry this throughout the whole season," Ruiz said.
Backup catcher Wil Nieves made his fifth start of the season Sunday.
Jesse Sanchez is a national reporter for MLB.com. Follow him on Twitter @JesseSanchezMLB. This story was not subject to the approval of Major League Baseball or its clubs.