With a once-in-a-lifetime chance to set a record with 73 wins by sweeping the final three games, they want to seize the opportunity beginning Saturday night against the Memphis Grizzlies. ''Everything is gravy at this point with coach Kerr,'' forward Draymond Green said. The Warriors (70-9) joined the 1995-96 Chicago Bulls as the only teams in NBA history to win 70 games in a season by beating San Antonio 112-101 on Thursday night to secure home-court advantage throughout the playoffs.