Originally Posted by kpresidente
Didn't the Reds platoon Bill Doran and Mariano Duncan in 1990?
The reason you don't see middle infield platoons has more to do with the fact that there's not a lot of left-handed middle infielders out there than any double play combo reason.
Doran was acquired at the trading deadline and only started only 11 games with the Reds. It was not a platoon, Duncan was the started and Doran filled in for him. Doran got on a mini hot streak and started 6 games in row at one point, but it was not a platoon.