I trusted my husband," she told the court in Barcelona, sobbing at times.
Sanchez Vicario was the first Spanish player to reach the top of women's tennis rankings.
"I just expect the truth to be told and this to be over," Santacana told reporters outside the court, where he is yet to be heard.
Sanchez Vicario was ordered in 2009 by the Supreme Court to pay a 5.2 million euros fine for tax fraud.
In a civil suit in 2014, a Spanish court ruled in favour of the bank but the money was never paid, so the bank resorted to the criminal courts.
Persons:
Arantxa Sanchez Vicario, Sanchez Vicario, Josep Santacana, Santacana, Sanchez, delcined, Fernando Kallas, Emma Pinedo, Horaci Garcia, Andrei Khalip, Angus MacSwan
Organizations:
Banque de Luxembourg, U.S, El Pais, La Vanguardia, Thomson
Locations:
BARCELONA, Spanish, Barcelona, Spain, Andorra