It seems this year the season ended earlier than usual, the finals already took place end of January.
On top of that, many Cuban players are currently busy with the World Baseball Classic. I would not expect any serious game to take place in Cuba during this period.
Update: The Classic just finished for the Cuban team, they lost miserably...
In case you go to Havana while there is an active baseball season, the place to go to watch a game would be "Estadio Latinoamericano", and in Santa Clara it would be the "Estadio Augusto César Sandino".
There is at least one stadium like those at each province capital.