|Birth Day:||September 16, 1960|
Tettleton's offensive output dropped in 1990 with a .223 batting average, 15 home runs, and 51 runs batted in. Although he struck out 160 times, setting a major league strikeout record for switch hitters, his on-base percentage increased from the previous year to .376, in part due to the 106 base on balls. In October, he was selected to the Associated Press All-Star team. At the end of the year, Tettleton opted for free agency, then surprised the Orioles by accepting their salary arbitration offer. They had expected him to accept a higher offer from another team and were not prepared to pay him more than $1 million. Two days after acquiring high-priced players Glenn Davis and Dwight Evans, the Orioles traded Tettleton to the Detroit Tigers for pitcher Jeff Robinson in what was seen as a cost-saving measure on the part of the Orioles.