Kennedy, a left-handed hitter, was the Giants' regular catcher last year.
He is one of only four regular catchers to field a perfect 1.000 for a full season.
But 15 of the regular catchers aren't even hitting .250.
"I wouldn't say we have a regular catcher," Martin said.
He also served as an outfielder, before becoming a regular catcher.
He did serve as Detroit's regular catcher in 1974.
With the Detroit Stars, he was the regular catcher for the first half of the season.
He assumed duties as the regular catcher for the rest of the season.
Hastings was the regular catcher for Chicago but his average fell to .254.
At seventeen in 1864 he was the regular catcher.