Table: lit_davis_cup_players
Columns: player
highest_singles_ranking
highest_doubles_ranking
first_year_played
years_played
ties_played
total_w_l
singles_w_l
doubles_w_l

Question: Name the minimum tiesplayed for 6 years
SQL: SELECT MIN("ties_played") FROM lit_davis_cup_players WHERE "years_played" = 6