Vera Zvonareva defeated Anabel Medina Garrigues 6-3, 6-4, and Svetlana Kuznetsova beat Carla Suarez Navarro 6-3, 6-1.
Russia leads the best-of-five series 2-0, and will go for the win Sunday, with reverse singles matches and a doubles match on the schedule.
Sunday's reverse singles have the former U.S. Open titlist Kuznetsova taking on Medina Garrigues and the Olympic bronze medalist Zvonareva meeting Suarez Navarro. The final rubber Sunday will be the doubles between Russians Elena Vesnina and Ekaterina Makarova, and Spaniards Nuria Llagostera Vives and Virginia Ruano Pascual.
Russia is 4-1 all-time against Spain, including a 5-0 opening-round victory in Moscow last year. It marked their first Fed Cup meeting in 17 years. The Russians have won three of the last four Fed Cup titles, .
Jordana Brewster on Paul Walker: 'He was an enormous presence in my life'
Benedict Cumberbatch's dramatic reading of R. Kelly lyrics is just what you need