Question: How many Grand Slam titles were won by the defending champion of the 1981 US Open - Women's Doubles?  
Sentence (from "Pam Teeguarden"): She played on the victorious Los Angeles Strings Team Tennis team in 1981 and won the Team Tennis Mixed Doubles Division with Tom Gullikson in 1977; they were also runners-up in the league that year.
Relevant evidence: No