Toms made his Big League debut in 1975, appearing in seven games for the Giants, going 0-1 with an earned run average at 6.10 over 10.1 innings of work.
The following season, Toms again appeared in seven games, and once again would go 0-1, this time with an ERA at 6.23 over 8.2 innings pitched, pretty much mirroring all of his numbers from the year before.
In 1977. Toms would end up appearing in only four games, again going 0-1 with an ERA at 2.08 with 4.1 innings pitched, in what would end up being his last taste of Major League action.
All told, Toms finished his career with an 0-3 record, with an ERA at 5.40 over 18 appearances and 23.1 innings pitched.