Technically Bo Jackson started playing in the MLB first (in 1986), but he didn't play in the NFL until 1991. Deion Sanders, started playing in the MLB in 1989 and in the NFL in 1990. So to answer your question, Deion Sanders played professionally in two sports before Bo Jackson.
Canada Created Hockey and Lacrosse.
DEION SANDERS! superbowl and world series Although Sanders played in both these events, he has "only" won the former. He played well for the 1992 Atlanta Braves, but this team lost the 1992 Series.
deion sanders has 6 known kids and two wives one divorced
Two. Sanders was a member of the San Francisco 49ers that won Super Bowl XXIX and the Dallas Cowboys that won Super Bowl XXX.
Me i have played basket ball while playing football
barry sanders who played in the nfl and mlb
No the two sports mainly played in Argentina are Soccer and Basketball
Curling & Ice Hockey
two of the most played sports in Colorado are football and baseball
Sanders wore No. 21 during his years with the Atlanta Falcons (1989-1993), the San Francisco 49ers (1994), the Dallas Cowboys (1995-1999) and the Washington Redskins (2000). He wore No. 37 during his two seasons with the Baltimore Ravens (2004-2005).
Australian Rules Football and Gaelic Football were his two main sports.
Bo Jackson