I see three reasons for my pick. Let's go one by one:

1. Hercules will be very weakened for this match. Two of the three main players are out as Valdez and Drenthe are suspended. Only Trezeguet will play, but I doubt he can do something alone. Plus defenders Abraham Paz (played 11 matches, scored 1 goal) and Noe Pamarot (played 15 matches) are also suspended. Three more players, Rufete (played 5 matches), Tiago Gomes (played 14 matches) and Sendoa (played 8 matches) are injured.

2. Racing Santander is in good form. They won two of the last three matches:

12.12. Mallorca - Santander 0:1
05.12. Malaga - Santander 4:1
28.11. Santander - La Coruna 1:0

3. Hercules lost the last three away matches, two of them with three goals difference:

06.12. La Coruna - Hercules 1:0
21.11. Espanyol - Hercules 3:0
07.11. Osasuna - Hercules 3:0

Considering all previous, I expect Racing Santander to win with at least two goals difference.