Mark Christman threw and batted right-handed, stood 5 feet 11 inches (1.80 m) tall and weighed 175 pounds (79 kg) during his baseball career.

He began his pro career in the Tigers' farm system that season and made the 1938 Detroit roster after batting .289 in the Texas League.

After playing most of that season as a utility infielder, he replaced the traded Harlond Clift as the team's regular third baseman in mid-August.

Christman struggled along with the other Browns' hitters; he collected only two singles in 22 at bats (.091), with no bases on balls and six strikeouts; in the field, he made one error in 13 total chances.

But, on the eve of the 1947 season, the 33-year-old veteran was sold to the Washington Senators, where he finished his big-league tenure as the starting third baseman (1947), regular shortstop (1948) and utility infielder (1949).