He was credited with a save in his April 18 debut, hurling 11⁄3 innings of one-hit, scoreless ball against the St. Louis Cardinals at Wrigley Field.

[2] He earned a second save nine days later when he preserved a 5–4 Cubs' triumph against the San Francisco Giants at Seals Stadium.

[3] At that point, Rodríguez' earned run average was a respectable 3.18, but he was hit hard in his next three outings, and by the time he was demoted to the minors after May 18, his ERA was a poor 7.36 in 71⁄3 innings pitched.

Obtained by the Phillies during the 1958–1959 offseason, he received only a one-game audition in June, when he allowed three earned runs in two innings pitched in middle relief against the Cincinnati Reds at Crosley Field on May 27.

In his eight MLB games, Rodríguez allowed 12 hits (including three home runs) and five bases on balls in his career 91⁄3 innings pitched, with six strikeouts.