1978 Topps Baseball #339 - Mario Guerrero

• Mario Guerrero signed with the San Francisco Giants as a free agent in December 1977. But Mario never played for the Giants during the regular season. On April 7 he was sent to the Oakland A's as a player to be named later in the Vida Blue trade.
• Guerrero had career highs in most categories in 1978. He was the starting shortstop for the A's for most of the season.
• Mario was replaced as the starting shortstop by Rob Picciolo in 1979 and he split time with Picciolo in 1980.
• 1978 Stats: .275, 3 HR, 38 RBI in 143 games
• 1978 Highlights:
• April 19 - Had four hits in Oakland's 6-5 win over the Minnesota Twins.
• April 29 - Knocked in four of Oakland's five runs as the A's beat the Cleveland Indians 5-1.
• May 12 - Hit a one-hopper off of the face of Tiger pitcher Steve Foucault in the 9th inning. A run scored during Oakland's seven run 9th inning and the A's won 10-4.