Although he didn't produce large offensive statistics, Manwaring excelled as a defensive player, winning the National League Gold Glove Award in 1993.

He was then selected by the San Francisco Giants in the second round of the 1986 draft out of Coastal Carolina University at the age of 21.

He finished the season with the National League's second-highest percentage of throwing out base stealers (45 percent).

He spent a decade with the Giants, until he was traded in July 1996 to the Houston Astros for Rick Wilkins and cash.

A very good defensive catcher, he recorded a .998 fielding percentage and won a Gold Glove award with the San Francisco Giants in 1993.